Pharmaceutical compounds

ABSTRACT

Diketopiperazines of the formula ##STR1## where one or both of R 1  and R 2 , which are different, are chosen from X and a phenyl group substituted by X, C(O)X, OC(O)CH 2  X, OCH 2  CH 2  X, CH 2  X, CONH(CH 2 ) n  X, O(CH 2 ) n  CH(OH)(CH 2 ) n  X ##STR2## and, where appropriate, the other of R 1  and R 2  is a phenyl group optionally substituted by one or more groups selected from halogen, nitro, methoxy, NHC(O)R 12 , CO 2  H, O(CH 2 ) n  N(R 12  R 13 ), C 1  -C 4  alkyl and (CH 2 ) n  C(O)OR 12  ; X is a five- or six-membered heterocyclic ring selected from the group consisting of pyridyl, imidazolyl, furyl, pyrrolyl, pyrrolidinyl, thienyl, piperazinyl, piperidinyl, morpholinyl, quinolyl, isoquinotyl and indolyl, the heteroatom(s) of the said heterocyclic ring, when nitrogen, being optionally substituted by hydrogen, methyl, oxygen, tertiary-butyloxycarbonyl, or SO 2  Me, the heterocyclic ring being optionally substituted by halogen  hydrogen!, methyl, MeS, phenyl, O(CH 2 ) n  N(R 12  R 13 ) or optionally containing one or more carbonyl groups and being optionally fused to a benzene ring; Y is O or S; R 12  and R 13 , which may be the same or different, are hydrogen or C 1  -C 6  alkyl; and n is 0 or an integer having the value 1, 2, 3 or 4; a pharmaceutically acceptable salts or esters having activity as inhibitors of plasminogen activator inhibitor.

The present invention relates to compounds useful as inhibitors of plasminogen activator inhibitor (PAI), to their preparation and to pharmaceutical and veterinary compositions containing them.

Plasminogen activators (Pas) are serine proteases which control the activation of the zymogen, plasminogen, to the active enzyme plasmin. Plasmin is important in a number of physiological and pathological processes including fibrinolysis, tissue remodelling, tumour growth and metastasis. The glycoprotein plasminogen activator inhibitor (PAI) is an endogenous fast-acting inhibitor of PA activity. PAI is a member of the serpin family and is synthesised by a variety of cells including endothelial cells. An imbalance between PAs and PAI contributes to a number of pathological conditions including haemostasis, inflammation, tumour growth and metastasis.

The present invention provides a diketopiperazine of formula (A): ##STR3## wherein one or both of R₁ and R₂, which may be the same or different, is:

(I) X, or a phenyl group which is substituted by X, C(O)X, OC(O)CH₂ X, OCH₂ CH₂ X, CH₂ X, CONH(CH₂)_(n) X, O(CH₂)_(n) CH(OH)(CH₂)_(n) X or ##STR4## or which is fused to a group X; (II) a phenyl group substituted by CH₂ NR₁₂ R₁₃, OC(O)(CH₂)_(n) Z, CH(OR₁₂)(OR₁₃), (CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) NR₁₂ R₁₃, --CH₂ NR₁₂ --(CH₂)_(n) NR₁₅ R₁₆ or O(CH₂)_(n) CH (OH)(CH₂)_(n) N (R₁₂ R₁₃);

(III) a group CH═C(W)V; or

(IV) a cyclohexyl group; and where appropriate, the other of R₁ and R₂ is a phenyl group optionally substituted by one or more groups independently selected from halogen, nitro, methoxy, NHC(O)R₁₂, CO₂ H, O(CH₂)_(n) N(R₁₂ R₁₃), CH₂ Y(CH₂)_(n) N(R₁₂ R₁₃), C₁ -C₄ alkyl and (CH₂)_(n) C(O)OR₁₂ ;

X is a naphthyl group or a five- or six-membered saturated or unsaturated heterocyclic group containing one or more heteroatoms, which heteroatoms may be the same or different and are independently selected from O, N and S; the heteroatom(s) when nitrogen being optionally substituted by hydrogen, methyl, oxygen, tertiary-butyloxycarbonyl, --(CH₂)_(n) CH₂ OH or SO₂ Me; the heterocyclic ring being optionally substituted by halogen, Me, MeS, phenyl, O(CH₂)_(n) NR₁₂ R₁₃, --N(R₁₂) (CH₂)_(n) N(R₁₂ R₁₃), --(CH₂)_(n) N(R₁₂ R₁₃) or --O(CH₂)_(n) O(CH₂)_(n) N(R₁₂ R₁₃), or the heterocyclic ring optionally containing one or more carbonyl groups and being optionally fused to a benzene ring, which benzene ring is optionally substituted by 1 or 2 C₁ -C₆ alkoxy groups;

Y is O or S;

Z is a C₃ -C₆ cycloalkyl group;

R₁₂, R₁₃ and R₁₄, which may be the same or different, are hydrogen or C₁ -C₆ alkyl;

R₁₅ and R₁₆, which may be the same or different, are hydrogen or C₁ -C₆ alkyl, or R₁₅ and R₁₆ form, together with the nitrogen atom to which they are attached, a 5- or 6-membered heterocyclic group;

W is hydrogen or a phenyl group;

V is a phenyl group optionally substituted by one or more groups independently selected from nitro, alkoxy, O(CH₂)_(n) NR₁₂ R₁₃, and NR₁₂ R₁₃ ; and

m and n are each, independently, 0 or an integer having tie value 1, 2, 3 or 4;

or a pharmaceutically acceptable salt or ester thereof.

A C₁ -C₆ alkyl group is, for example, a C₁ -C₄ alkyl group, such as a methyl, ethyl, propyl, i-propyl, n-butyl, sec-butyl or tert-butyl group.

A halogen may be F, Cl, Br or I.

In compounds of formula A free rotation may occur at room temperature about the single bonds connecting substituents R₁ and R₂ to the double bonds at positions 3 and 6 of the piperazine-2,5-dione ring.

In one embodiment at least one of R₁ and R₂, which may be the same or different, is chosen from a naphthyl group, X, a phenyl group substituted by X, C(O)X, OC(O)CH₂ X, OCH₂ CH₂ X, or CH₂ X and a phenyl group which is fused to a group X; wherein X is a five- or six-membered saturated or unsaturated heterocyclic group containing one or two heteroatoms, which heteroatoms may be the same or different and are independently selected from O, N and S, the heteroatom(s) when nitrogen being optionally substituted by hydrogen, methyl, oxygen, tertiary-butyloxycarbonyl, --(CH₂)_(n) CH₂ OH or SO₂ Me, the heterocyclic ring being optionally substituted by hydrogen, halogen, methyl, MeS, phenyl, O(CH₂)_(n) NR₁₂ R₁₃, O(CH₂)_(n) N(R₁₂ R₁₃) or --O(CH₂)_(n) O(CH₂)_(n) N(R₁₂ R₁₃); the heterocyclic ring optionally containing one or more carbonyl groups, and being optionally fused to a benzene ring; and the other of R₁ and R₂ is a phenyl group optionally substituted at the 2, 3 or 4-position by CH₂ NR₁₂ R₁₃, (CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) NR₁₂ R₁₃, halogen, nitro, --NHC(O)R₁₂, --O(CH₂)_(n) N(R₁₂ R₁₃) or --CH₂ Y(CH₂)_(n) N(R₁₂ R₁₃) wherein Y is O or S. In a particularly preferred series of compounds the said other of R₁ and R₂ is a phenyl group substituted at the 4-position by --O(CH₂)_(n) N(R₁₂ R₁₃), --CH₂ Y(CH₂)_(n) N(R₁₂ R₁₃) or --(CH₂)_(n) NR₁₄ C(O) (CH₂)_(m) NR₁₂ R₁₃.

In a further embodiment one of R₁ and R₂ is X, a phenyl group substituted by X, --CH₂ X, --OCH₂ CH₂ X, O(CH₂)_(n) CH(OH)CH₂ X or ##STR5## wherein X is a 5 or 6-membered saturated or unsaturated heterocyclic group as defined above which is optionally substituted and optionally fused to a benzene ring, for instance a pyridyl, imidazolyl, furyl, pyrrolyl, pyrrolidinyl, thienyl, piperazinyl, piperidinyl, morpholinyl, quinolyl, isoquinolyl or indolyl group; and the other of R₁ and R₂ is a phenyl group optionally substituted at the 4-position by --O(CH₂)_(n) N(R₁₂ R₁₃) --CH₂ Y(CH₂)_(n) N(R₁₂ R₁₃) or --(CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) NR₁₂ R₁₃. In this embodiment it is particularly preferred for X to be a furyl, imidazolyl, pyrrolyl, thienyl, morpholinyl, piperidinyl or isoquinolyl group.

In a further embodiment, R₁₂ and R₁₃, which may be the same or different, are hydrogen or C₁ -C₃ alkyl and n is an integer of value 1 or 2.

In a yet further embodiment one of R₁ and R₂ is a phenyl group which is substituted by X, CO(X), OCO(O)CH₂ X, OCH₂ CH₂ X, CH₂ X or which is fused to a group X, wherein X is a five- or six-membered heterocyclic ring containing one or two heteroatoms which may be the same or different, independently selected from O, N and S, the heteroatom(s) when nitrogen being optionally substituted by methyl, and the heterocyclic ring being optionally fused to a benzene ring.

In another embodiment one of R₁ and R₂ is a phenyl group substituted by CH₂ NR₁₂ R₁₃, OC(O)(CH₂)_(n) Z, CH(OR₁₂)(OR₁₃), (CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) N(R₁₂ R₁₃); wherein R₁₂, R₁₃ and R₁₄, which may be the same or different, are independently selected from hydrogen or C₁ -C₃ alkyl; Z is a C₅ or C₆ cycloalkyl group; and m and n are, independently, integers having the values 1, 2 or 3.

In a further embodiment R₁₂, R₁₃ and R₁₄, which may be the same or different, are independently selected from hydrogen and C₁ -C₂ alkyl; Z is a cyclopentyl group; and m and n are, independently, integers having the values of 1 or 2.

In a yet further embodiment one of R₁ and R₂ is a phenyl group optionally substituted by one or more groups independently selected from chloro, nitro, methoxy, NHCOR₁₂, CO₂ H and O(CH₂)_(n) NR₁₂ R₁₃ ; R₁₂ and R₁₃, which may be the same or different, are independently selected from hydrogen or methyl and n is an integer having the value 1 or 2.

In another embodiment one of R₁ and R₂ is a group CH═C(W)V, W is a phenyl group optionally substituted by one of more groups independently selected from nitro, methoxy and O(CH₂)_(n) NMe₂ and n is an integer having the value 1, 2,3 or 4.

In a further embodiment n is 1 or 2.

In a yet further embodiment one of R₁ and R₂ is a phenyl group optionally substituted by NHAc or methoxy.

In another embodiment one of R₁ and R₂ is cyclohexyl and the other is a phenyl group optionally substituted by NHC(O)R₁₂.

In a further embodiment one of R₁ and R₂ is cyclohexyl and the other is a phenyl group optionally substituted by NHC(O)Me.

In a further embodiment R₃ is C₁ -C₂ alkyl or (CH₂)_(n) C(O)OR₁₂ ; R₁₂ is hydrogen or C₁ -C₂ alkyl and n is an integer of value 1 or 2.

In a yet further embodiment R₃ is methyl or CH₂ C(O)OR₁₂ and R₁₂ is hydrogen or methyl.

Certain diketopiperazines have been disclosed as having utility as bioactive agents. Yokoi et al in J. Antibiotics vol XLI No. 4, pp 494-501 (1988) describe structure-cytotoxicity relationship studies on a series of diketopiperazines related to neihumicin, a compound obtained from the micro-organism Micromonospora neihuensis. Kamei et al in J. Antibiotics vol XLIII No. 8, 1018-1020 disclose that two diketopiperazines, designated piperafizines A and B, have utility as potentiators of the cytotoxicity of vincristine.

Examples of specific compounds of formula A are as follows. The compound numbering is adhered to in the rest of the specification:

1926 (3Z,6Z)-3-Benzylidene-6-(4-imidazolyl)methylene-2,5-piperazinedione.

1930 (3Z,6Z)-3-Benzylidene-6-(4-(1-imidazolyl)benzylidene-2,5-piperazinedione.

1929 (3Z,6Z)-3-Benzylidene-6-(4-(1-imidazolylmethyl)benzylidene)-2,5-piperazinedione.

1959 (3Z,6Z)-3,Benzylidene-6-(4-(2-dimethylaminoethoxy)-3-methoxybenzylidene)-2,5-piperazinedione hydrochloride.

1927 (3Z,6Z)-3-Benzylidene-6-(4-(5-methylimidazolyl))methylene-2,5-piperazinedione.

1921 (3Z,6Z)-3-Benzylidene-6-(4-dimethylaminocinnamylidene)-2,5-piperazinedione.

1976 (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)benzylidene-2,5-piperazinedione.

1910 (3Z,6Z)-3-Benzylidene-6-(4-(2-imidazolylethoxy)benzylidene)-2,5-piperazinedione.

1923 (3Z,6Z)-3-Benzylidene-6-(4-nitrocinnamylidene-2,5-piperazinedione.

1657 (3Z,6Z)-3-(4-Aminomethylbenzylidene)-6-(4-methoxybenzylidene)-2,5-piperazinedione.

1693 (3Z,6Z)-3-(1-methanesulfonyl-3-indolyl)methylene-6-(4-methoxybenzylidene)-2,5-piperazinedione.

1886 (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(4-phthalimidoacetoxybenzylidene)-2,5-piperazinedione.

1922 (3Z,6Z)-3-Benzylidene-6-(γ-phenylcinnamylidene)-2,5-piperazinedione.

1618 (3Z,6Z)-3-(1-tert-butoxycarbonyl-3-indolyl)methylene-6-(2-thenylidene)-2,5-piperazinedione.

1560 (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(1-tert-butoxycarbonyl-3-indolyl)methylene-2,5-piperazinedione.

1950 (3Z,6Z)-3-Benzylidene-6-(4-(2-dimethylaminoethoxy)-3-methoxycinnamylidene)-2,5-piperazinedione.

1975 (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolylmethyl)benzylidene)-2,5-piperazinedione.

1983 (3Z,6Z)-3-Benzylidene-6-(4-N-methyl-N-(4-(N-methylpiperidinyl))aminomethylbenzylidene-2,5-piperazinedione.

1509 (3Z,6Z)-3-Benzylidene-6-(3-indolylmethylene)-2,5-piperazinedione.

1542 (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(3-furylmethylene)-2,5-piperazinedione.

1545 (3Z,6Z)-3-(3-Indolylmethylene)-6-(4-methoxybenzylidene)-2,5-piperazinedione.

1507 (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(2-(1-tertbutoxycarbonyl)pyrrolyl)methylene-2,5-piperazinedione.

1506 (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(3-(1-tert-butoxycarbonyl)indolyl)methylene-2,5-piperazinedione.

1471 (3Z,6Z)-3-Benzylidene-6-(3-(1-tert-butoxycarbonyl)indolyl)methylene-2,5-piperazinedione.

1474 (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(2-thienylmethylene)-2,5-piperazinedione.

1476 (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(3-furylmethylene)-2,5-piperazinedione.

1672 (3Z,6Z)-3-(Acetamidobenzylidene)-6-cyclohexylmethylene-2,5-piperazinedione.

1676 (3Z,6Z)-3-(4-Acetamidobenzylidene)-6-cinnamylidene-2,5-piperazinedione.

1891 (3Z,6Z)-3-Benzylidene-6-(diethoxymethylbenzylidene)-2,5-piperazinedione.

1982 (3Z,6Z)-3-Benzylidene-6-(4-(N-methyl-N-(2-dimethylaminoethyl)aminomethylbenzylidene-2,5-piperazinedione hydrochloride.

1884 (3Z,6Z)-3-Benzylidene-6-cyclohexylmethylene-2,5-piperazinedione.

1845 (3Z,6Z)-3-(4-Acetamidobenzylidene)-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione.

1950 (3Z,6Z)-3-benzylidene-6-(4-(2-dimethylaminoethoxy)-3-methoxycinnamylidene)-2,5-piperazinedione.

1718 (3Z,6Z)-3-(2-Indolylmethylene)-6-(4-methoxybenzylidene)-2,5-piperazinedione.

1808 (3Z,6Z)-3-Benzylidene-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione.

1809 (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione.

1470 (3Z,6Z)-3-Benzylidene-6-(2-(1-tertbutoxycarbonyl)pyrrolyl)methylene-2,5-piperazinedione.

5023 (3Z,6Z)-3-(4-Dimethylaminomethylbenzylidene)-6-(4-(3-dimethylaminopropoxy)benzylidene-2,5-piperazinedione.

5026 (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)methylbenzylidene)-2,5-piperazinedione.

5030 (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)benzylidene)-2,5-piperazinedione.

5367 (2-(4-((3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzoyl)-1,2,3,4-tetrahydroisoquinoline.

5386 N-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)-4-((3Z,6Z)-6-(4-(3-dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzamide.

5397 N-(4-(1,2,3,4-Tetrahydro-2-isoquinolyl)butyl)-4-((3Z,6Z)-6-(4-(3-dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzamide.

5027 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene-3-(4-pyridylmethylene)-2,5-piperazinedione.

5028 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-pyridylmethylene)-2,5-piperazinedione.

5041 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-furfurylidene-2,5-piperazinedione.

5042 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-Thenylidene)-2,5-piperazinedione.

5046 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(2-Thenylidene)-2,5-piperazinedione.

5052 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-Furylmethylene)-2,5-piperazinedione.

5188 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(2-Naphthylmethylene)-2,5-piperazinedione.

5200 (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(1-Naphthylmethylene)-2,5-piperazinedione.

5032 (3Z,6Z)-6-Benzylidene-3-(4-(3-dimethylamino-2-hydroxypropoxy)benzylidene)-2,5-piperazinedione.

5040 (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-morpholinopropoxy)benzylidene)-2,5-piperazinedione.

5057 (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-(1-imidazolyl)propoxy)benzylidene)-2,5-piperazinedione.

5043 (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-(4-(2-hydroxyethyl)-1-piperazinyl)propoxy)benzylidene)-2,5-piperazinedione.

5062 (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione.

5071 (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione.

5072 (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(5-methylthio-2-thenylidene)-2,5-piperazinedione.

5054 (3Z,6Z)-6-Benzylidene-3-(4-(2-morpholinoethoxy)benzylidene)-2,5-piperazinedione.

5055 (3Z,6Z)-6-Benzylidene-3-(4-(2-(1-imidazolyl)ethoxy)benzylidene)2,5-piperazinedione.

5053 (3Z,6Z)-6-Benzylidene-3-(4-(2-(1-pyrrolidinyl)ethoxy)benzylidene)2,5-piperazinedione.

5069 (3Z,6Z)-6-(4-(2-Dimethylaminoethoxymethyl)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione.

5077 (3Z,6Z)-6-(4-(2-Dimethylaminoethoxymethyl)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione.

5074 (3Z,6Z)-6-(4-Dimethylaminoacetamidomethyl benzylidene)-3-(3-thenylidene)-2,5-piperazinedione.

5079 (3Z,6Z)-3-(2-Bromobenzylidene)-6-(4-dimethylaminoacetamidomethylbenzylidene)-2,5-piperazinedione.

5081 (3Z,6Z)-6-(4-Dimethylaminoacetamidomethylbenzylidene)-3-(3-furylmethylene)-2,5-piperazinedione.

5061 (3Z,6Z)-6-Benzylidene-3-(4-dimethylaminoacetamidomethylbenzylidene)-2,5-piperazinedione.

5073 (3Z,6Z)-6-(4-(2-Dimethylaminoethylthiomethyl)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione.

5078 (3Z,6Z)-6-(4-(2-Dimethylaminoethylthiomethyl)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione.

1912 (3Z,6Z)-6-Benzylidene-3-(4-dimethylaminoacetamidoaminomethylbenzylidene)-2,5-piperazinedione.

5324 (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethoxy)-2-thienylmethylene)-2,5-piperazinedione.

5327 (3Z,6Z)-6-Benzylidene-3-(4-(2-dimethylaminoethoxy)-2-thienylmethylene)-2,5-piperazinedione.

5335 (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethyl)-2-thienylmethylene)-2,5-piperazinedione.

5388 (3Z,6Z)-6-Benzylidene-3-(5-(2-(2-dimethylaminoethoxy)ethoxy)-2-thienylmethylene)-2,5-piperazinedione.

5389 (3Z,6Z)-6-Benzylidene-3-(5-(6-dimethylaminohexyloxy)-2-thienylmethylene)-2,5-piperazinedione.

5299 (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethyl)methylamino-2-thienylmethylene)-2,5-piperazinedione.

5075 (3Z,6Z)-3-(2,5-Dichloro-3-thenylidene)-6-benzylidene-2,5-piperazinedione.

5371 N-(4-(1,2,3,4-Tetrahydro-2-isoquinolyl)butyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide.

5391 N-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide.

5394 N-(3-(1,2,3,4-Tetrahydro-2-isoquinolyl)propyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide.

5393 N-(4-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)phenyl-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide.

5402 N-(4-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)phenyl)-4-((3Z,6Z)-2,5-dioxo-6-(4-nitrobenzylidene)-3-piperazinylidene)methylbenzamide.

Compounds of formula A, may be prepared by a process which comprises either (i) condensing compound of formula (I) ##STR6## wherein R₂ is as defined above and is optionally protected, with a compound of formula (II):

    R.sub.1 --CHO                                              (II)

wherein R₁ is as defined above and is optionally protected, in the presence of a base in an organic solvent; or (ii) condensing a compound of formula (I'): ##STR7## wherein R₁ is as defined above and is optionally protected, with a compound of formula (III):

    R.sub.2 --CHO                                              (III)

wherein R₂ is as defined above and is optionally protected, in the presence of a base in an organic solvent; and, in either case (i) or (ii), if required, removing optionally present protecting groups and/or, if desired, converting one compound of formula A into another compound of formula A, and/or, if desired, converting a compound of formula A into a pharmaceutically acceptable salt or ester thereof, and/or, if desired, converting a salt or ester into a free compound, and/or, if desired, separating a mixture of isomers of compounds of formula A into the single isomers.

A compound of formula A produced directly by the condensation reaction between (I) and (II) or (I') and (III) may be modified, if desired, by converting R₁ into a different R₁ group. These optional conversions may be carried out by methods known in themselves. For example, a compound of formula A in which R₁ comprises an ester group may be converted to a compound of formula A wherein the corresponding substituent is a free --COOH or OH group, by acid or alkaline hydrolysis at a suitable temperature, for example from ambient temperature to 100° C.

A compound of formula A in which either or both of R₁ and R₂ includes an --OH group may be converted into a compound of formula A wherein the corresponding substituent is esterified, for example by treating with a suitable carboxylic acid in the presence of an appropriate coupling agent, acid anhydride or acid chloride in an inert solvent.

A compound of formula A in which either or both of R₁ and R₂ includes a --CO₂ H group may be converted into a compound of formula A wherein the corresponding substituent is esterified, for example by treating the carboxylic acid with a suitable C₁ -C₆ alkyl alcohol in the presence of 1,3-dicyclohexylcarbodiimide in an inert solvent.

A compound of formula A in which either or both of R₁ and R₂ includes a free --CO₂ H group may be converted into a compound of formula A in which the corresponding substituent is a group --CON(R₁₁ R₁₂), wherein R₁₁ and R₁₂ are as defined above, for example by treatment with ammonia or an amine in the presence of 1,3-dicyclohexylcarbodiimide in an inert solvent.

A compound of formula A in which either or both of R₁ and R₂ includes a free --CO₂ H group may be converted into a compound of formula A wherein the corresponding substituent is a --CH₂ OH group by reduction, for example using borane in a suitable solvent such as tetrahydrofuran.

A compound of formula A in which either or both of R₁ and R₂ is a nitro group may be converted into a compound of formula A in which the corresponding substituent is an amino group by reduction under standard conditions, for example by catalytic hydrogenation.

Protecting groups for substituents on R₁ and/or R₂ in any of the compounds of formulae (I), (I'), (II) and (III) are optionally introduced prior to step (i) or step (ii) when either or both R₁ and R₂ include one or more groups which are sensitive to the condensation reaction conditions or incompatible with the condensation reaction, for example a --COOH, --CH₂ OH or amino group. The protecting groups are then removed at the end of the process. Any conventional protecting group suitable for the group R₁ and/or R₂ in question may be employed, and may be introduced and subsequently removed by well-known standard methods.

The condensation reaction between compounds (I) and (II) or (I') and (III) is suitably performed in the presence of a base which is potassium t-butoxide, sodium hydride, potassium carbonate, sodium carbonate, caesium carbonate, sodium acetate, potassium fluoride on alumina, or triethylamine in a solvent such as dimethylformamide, potassium t-butoxide in t-butanol, or a mixture of t-butanol and dimethylformamide (DMF). The reaction is typically performed at a temperature from 0° C. to the reflex temperature of the solvent.

The compounds of formula (I) may be prepared by a process comprising reacting 1,4-diacetyl-2,5-piperazinedione with a compound of formula (III) as defined above, in the presence of a base in an organic solvent. Similarly, the compounds of formula (I') may be prepared by a process which comprises reacting 1,4-diacetyl-2,5-piperazinedione with a compound of formula (II) as defined above, in the presence of a base in an organic solvent.

If necessary, the resulting compound of formula (I) or (I') can be separated from other reaction products by chromatography.

The reaction of 1,4-diacetyl-2,5-piperazinedione with the compound of formula (III) or (II) is suitably performed under the same conditions as described above for the condensation between compounds (I) and (II), or (I') and (III).

The substituted aldehydes of formulae (II) and (III) are known compounds or can be prepared from readily available starting materials by conventional methods. The 1,4-diacetyl-2,5-piperazinedione used as a starting material in the preparation of compounds of formula (I) may be prepared by treating 2,5-piperazinedione (glycine anhydride) with an acetylating agent. The acetylation may be performed using any conventional acetylating agent, for example acetic anhydride under reflux or, alternatively, acetic anhydride at a temperature below reflux in the presence of 4-dimethylaminopyridine.

Compounds of formula (I) may also be prepared by the microwave irradiation of a mixture comprising 1,4-diacetyl-2,5-piperazinedione, a compound of formula (III) and potassium fluoride on alumina (as base) in the absence of solvent.

Compounds of formula (I) may alternatively be prepared directly from 2,5-piperazinedione (glycine anhydride) by a process which comprises treating the 2,5-piperazinedione with a mixture comprising a compound of formula (III), sodium acetate and acetic anhydride at an elevated temperature, for example under reflux.

Compounds of formula (I') may be prepared by analogous processes, replacing compound (III) in each case by a compound of formula (II).

Compounds of formula A may also be prepared by a process comprising the microwave irradiation of (i) a mixture comprising a compound of formula (I) as defined above, a compound of formula (II) and potassium fluoride on alumina, or (ii) a mixture comprising a compound of formula (I') a compound of formula (III) and potassium fluoride on alumina, or (iii) a mixture comprising 1,4-diacetyl-2,5-piperazinedione, a compound of formula (II), a compound of formula (III) and potassium fluoride on alumina. The irradiation is performed in the absence of a solvent.

Compounds of formula (A) may also be obtained directly by a process which comprises condensing together 1,4-diacetyl-2,5-piperazinedione, a compound of formula (II) and a compound of formula (III) in the presence of a base in an organic solvent. Suitable bases, solvents and reaction conditions are as described above for the condensation reaction between, for example, compounds (I) and (II).

An alternative direct process for the preparation of compounds of formula (A) comprises condensing together 2,5-piperazinedione, a compound of formula (II) and a compound of formula (III) in the presence of sodium acetate and acetic anhydride at elevated temperature, for example under reflux.

An alternative process for the preparation of compounds of formula (I) comprises treating a compound of formula (V): ##STR8## wherein R₆ to R₁₀ are as defined above, X is a halogen and R' is a C₁ -C₆ alkyl group, with ammonia followed by acetic anhydride.

Compounds of formula (I') may be prepared by an analogous process which comprises treating a compound of formula (V'): ##STR9## wherein R₁ to R₅, X and R' are as defined above, with ammonia followed by acetic anhydride.

X in formula (V) or (V') is typically iodine. R' is, for example, a C₁ -C₄ alkyl group such as a methyl, ethyl, propyl, i-propyl, butyl, sec-butyl or tert-butyl group.

A review of synthetic approaches to unsaturated 3-monosubstituted and 3,6-disubstituted-2,5-piperazinediones is provided in Heterocycles, 1983, 20, 1407 (C.Shin).

Compounds of formula (A) may be optionally washed after any of the above preparative procedures with one or more of the following: water, ethanol, ethyl acetate and diethyl ether.

Where appropriate compounds of formula (A) may be optionally recrystallised from a suitable solvent such as methanol or acetic acid.

Compounds of formula (A) may be converted into pharmaceutically acceptable salts, and salts may be converted into the free compound, by conventional methods Suitable salts include salts with pharmaceutically acceptable, inorganic or organic, acids or bases. Examples of inorganic bases include ammonia and carbonates, hydroxides and hydrogen carbonates of group I and group II metals such as sodium, potassium, magnesium and calcium. Examples of organic bases include aliphatic and aromatic amines such as methylamine, triethylamine, benzylamine, dibenzylamine or α- or β-phenylethylamine, and heterocyclic bases such as piperidine, 1-methylpiperidine and morpholine. Examples of inorganic acids include hydrochloric acid, sulphuric acid and orthophosphoric acid. Examples of organic acids include p-toluenesulphonic acid, methansulphonic acid, mucic acid and succinic acid.

Compounds of formula (A) may also be converted into pharmaceutically acceptable esters. Suitable esters include branched or unbranched, saturated or unsaturated C₁ -C₆ alkyl esters, for example methyl, ethyl and vinyl esters.

The diketopiperazines of formula (A), both novel and known and their pharmaceutically acceptable salts and esters (referred to hereinafter as the "present compounds") have utility as inhibitors of PAI. Elevated levels of PAI-1, by reducing the net endogenous fibrinolytic capacity, can contribute to the pathogenesis of various thrombotic disorders including myocardial infarction, deep vein thrombosis and disseminated intravascular coagulation. The present compounds therefore can act as inhibitors of the tPA/PAI-1 interaction. The present compounds can be used in the treatment of haemostatic disorders. A human or animal, e.g. a mammal, can therefore be treated by a method comprising administration of a therapeutically effective amount of a diketopiperazine of formula (A) or a pharmaceutically or veterinarily acceptable salt thereof.

Tissue plasminogen activator (tPA) is used as a fibrinolytic agent in the treatment of thrombotic disorders. The efficacy of the tPA in this role may be enhanced if it is administered together with a PAI inhibitor. A human or animal, e.g. a mammal, can therefore be treated by a method comprising the combined administration of a therapeutically effective amount of tPA and a therapeutically effective amount of any one of the present compounds. The present invention also provides products containing a diketopiperazine of formula (A) or a pharmaceutically acceptable salt or ester thereof and tPA as a combined preparation for simultaneous, separate or sequential use in the treatment of thrombotic disorders, for example where there is inappropriate PAI activity. In such products the present compound is formulated for oral or parenteral (intravenous, intramuscular or subcutaneous) administration and the tPA is formulated for intravenous administration.

As one example, during acute myocardial infarction (MI) one of the present compounds may be administered to a patient together with tPA to enhance the efficacy of the tPA treatment. As a further example, early re-occlusion following treatment of a patient with tPA may be prevented by the post-MI administration of one of the present compounds.

The compounds of formula (A) have been tested in a PAI functional assay. In this assay, a compound is incubated with PAI-1 prior to addition to the tPA assay system. Inhibition of PAI-1 results in the production of plasmin from plasminogen. In turn, plasmin cleaves the chromogenic substrate S2251 (Kabi Vitrum) producing pNA (p-nitroaniline) which is detected spectrophotometrically at 405 nm (K. Nilsson et al, Fibrinolysis (1987) 1, 163-168). The results of the assay are reported below.

The present compounds can be administered in a variety of dosage forms, for example orally such as in the form of tablets, capsules, sugar- or film-coated tablets, liquid solutions or suspensions or parenterally, for example intramuscularly, intravenously or subcutaneously. The present compounds may therefore be given by injection or infusion.

The dosage depends on a variety of factors including the age, weight and condition of the patient and the route of administration. Typically, however, the dosage adopted for each route of administration when a compound of the invention is administered alone to adult humans is 0.001 to 10 mg/kg, most commonly in the range of 0.01 to 5 mg/kg, body weight. Such a dosage may be given, for example, from 1 to 5 times daily by bolus infusion, infusion over several hours and/or repeated administration.

When one of the present compounds is administered in combination with tPA to adult humans, the dosage adopted for each route of administration is typically from 0.001 to 10 mg, more typically 0.01 to 5 mg per kg body weight for a compound of the invention and from 5 to 500 mg administered intravenously for the tPA. A suitable dosage regimen for the tPA is 100 mg given intravenously over 3 hours as follows: 10% of the total dose as an i.v. bolus over 1-2 minutes, 50% of the total dose as an infusion over 1 hour, 40% of the total dose as an infusion over the subsequent 2 hours.

A diketopiperazine of formula (A) or a pharmaceutically acceptable salt or ester thereof is formulated for use as a pharmaceutical or veterinary composition also comprising a pharmaceutically or veterinarily acceptable carrier or diluent. The compositions are typically prepared following conventional methods and are administered in a pharmaceutically or veterinarily suitable form. An agent for use as an inhibitor of PAI comprising any one of the present compounds is therefore provided.

For example, the solid oral forms may contain, together with the active compound, diluents such as lactose, dextrose, saccharose, cellulose, corn starch or potato starch; lubricants such as silica, talc, stearic acid, magnesium or calcium stearate and/or polyethylene glycols; binding agents such as starches, arabic gums, gelatin, methylcellulose, carboxymethylcellulose, or polyvinyl pyrrolidone; disintegrating agents such as starch, alginic acid, alginates or sodium starch glycolate; effervescing mixtures; dyestuffs, sweeteners; wetting agents such as lecithin, polysorbates, lauryl sulphates. Such preparations may be manufactured in known manners, for example by means of mixing, granulating, tabletting, sugar coating, or film-coating processes.

Liquid dispersions for oral administration may be syrups, emulsions and suspensions. The syrups may contain as carrier, for example, saccharose or saccharose with glycerol and/or mannitol and/or sorbitol. In particular, a syrup for diabetic patients can contain as carriers only products, for example sorbitol, which do not metabolise to glucose or which only metabolise a very small amount to glucose. The suspensions and the emulsions may contain as carrier, for example, a natural gum, agar, sodium alginate, pectin, methylcellulose, carboxymethylcellulose or polyvinyl alcohol.

Suspensions or solutions for intramuscular injections may contain, together with the active compound, a pharmaceutically acceptable carrier such as sterile water, olive oil, ethyl oleate, glycols such as propylene glycol, and, if desired, a suitable amount of lidocaine hydrochloride. Some of the present compounds are insoluble in water. A compound may be encapsulated within liposomes.

TESTING OF THE PRESENT COMPOUNDS AS PAI INHIBITORS

Compounds of formula (A) were tested in a PAI chromogenic substrate assay. In the assay (K. Nilsson, Fibrinolysis (1987) 1, 163-168) each compound was incubated with PAI-1 prior to addition to the tPA assay system. Inhibition of PAI-1 by the compound of formula (A) resulted in the production of plasmin from plasminogen. In turn, the plasmin cleaved the chromogenic substrate S2251 (Kabi-Vitrum) producing pNA (p-nitroaniline) which was detected scectrophotometrically at 405 nm.

The degrees of inhibition observed in the chromogenic substrate assay at various concentrations, and/or IC₅₀ values, of compounds of formula (A) are presented in Table 1. IC₅₀ values for some compounds, not shown in Table 1, are listed in Table 2 which follows Table 1.

                  TABLE 1     ______________________________________     INHIBITION OF PAI-1 IN THE S2251     CHROMOGENIC SUBSTRATE ASSAY     ______________________________________     Compound             Concentration in μm     No.     100       50      25      12.5 6.25     ______________________________________     1470    70        20      2       0    0     1471    80        60      20      6    0     1474    64        52      28     1476    68        48      18     1506    75        58      26      4    2     1507    78        62      45      1    1     1509    58        35      1       1    1     1542    75        41      9       1    1     1545    87        64      39      5    1     1560    50        48      46      34   13     1618    51        32      3       1     1649    34        0       1       0     1657    53        60      46      2     1672    70        44      13      4    1     1676    29        51      52      12   1     1693    89        2       1       0     1718    62        1       0       0    1     1808    76        48      73      2    1     1809    81        76      84      7    1     1845    14        30      49      60   53     1884    40        14      0       0    0     1886    42        40      18      6    0     1891    28        36      17      3    3     1910    27        36      50      61   63     1912    30        55      29      22   17     1921    65        43      25      14   16     1922    13        11      26      13   14     1923    38        31      20      12   13     1926    36        35      12      6    10     1927    33        39      20      22   14     1928    67        60      47      24   19     1929    27        45      59      48   16     1930    54        61      79      38   30     1959    5         1       2       2    1     1975    7         0       0       0    0     1976    3         0       0       0    0     1950    19        3       2       2    1     1982    48        49      28      6    1     1983    34        14      0       0    0     ______________________________________     Compound             Concentration in μM     No.     100 μM 50 μM                               20 μM                                       IC.sub.50     ______________________________________     5023                      1     5026    34                10     5027    12        8       8     5028    11        4       4     5030    20        7       6     5032    65        62      63      25.0-12.0     5040    0         1       0     5041    1         0       0     5042    77        64      42      20.0-10.0     5043    21        15      1     5048    55        19      11      100.0-50.0     5052    77        76      86      12.0-6.0     5053    68        64      56      25.0-12.0     5054    5         57      48      50.0-25.0     5055    69        69      70      6.0-3.0     5057    44        29      37     5061    43        48      60      25.0-12.0     5062    78        81      87      12.0-6.0     5069    70        71      75      10.0-5.0     5071    80        82      73      10.0-5.0     5072    60        61      61      10.0-5.0     5073    63        70      14      20.0-10.0     5074    47        57      26      20.0-10.0     5075    88        88      52      25.0-12.0     5077    34        46      42     5078    60        67      11      20.0-10.0     5079    44        58      14      20.0-10.0     5081    25        34      50      6.0-3.0     5188    90                94      3.50     5200    10                10     5205    56                33      100.0     5206    72                78      3.0     5299                              7.00     5324                              9.00     5327                      17     5335                              22.0     5367                              18.00     5371                              12.00     5376                              12.00     5379                      65      15.00     5386                              18.00     5388                      58      9.00     5388.HCl                  60      12.00     5389                      55      2.50     5389.HCl                  57      2.50     5391                      64      6.50     5391.HCl                  100     3.50     5393                      76      14.00     5393.HCl                  58      20.00     5394                      59      16.00     5394.HCl                  62      17.00     5397                      42     5397.HCl                  21     5402                      37     5402.HCl                  37     ______________________________________

                  TABLE 2     ______________________________________     Compound No.   IC50 (μm)     ______________________________________     1470            50.0-100.0     1471           25.0-50.0     1474           25.0-50.0     1476            50.0-100.0     1506           25.0-50.0     1507           25.0-50.0     1509            50.0-100.0     1542            50.0-100.0     1560            50.0-100.0     1618            50.0-100.0     1652           25.0-50.0     1657           25.0-50.0     1672            50.0-100.0     1676           12.0-25.0     1693            50.0-100.0     1718            50.0-100.0     1808           25.0-12.0     1809           25.0-12.0     1845           10.0-5.0     1888            50.0-100.0     1910            5.0-10.0     1912           25.0-50.0     1921           100.0-50.0     1928           25.0-50.0     1929           25.0-12.0     1930           25.0-12.0     1982           50.0-25.0     ______________________________________

REFERENCE EXAMPLE 1 Preparation of (3Z)-1-acetyl-3-benzylidene-2,5-piperazinedione

1,4-Diacetyl-2,5-piperazinedione (25.0 g, 126 mmol), which is compound (8) mentioned in Reference Example 3, was heated at 120°-130° C. in DMF (200 ml) with triethylamine (17.6 ml, 126 mmol) and benzaldehyde (13.0 ml, 126 mmol). After 4 h the mixture was cooled to room temperature and poured into EtOAc (1000 ml), and washed three times with brine. Any solid formed at this stage was filtered off.

The filtrate was dried (MgSO₄) and the solvent removed in vacuo. The residue was recrystallised from EtOAc:Hexane to give 11.78 g (38%) of the title compound as a yellow solid.

¹ H NMR (CDCl₃ 400 MHz) δ=2.69 (3H, s) 4.54 (2H, s) 7.20 (1H, s) 7.40 (3H, m), 7.48 (2H, m), 7.93 (1H, br.s)

MS(DCI,NH₃): 262 (MNH₄ ⁺, 20%), 245 (MH⁺, 53%), 220 (52%), 204 (1006), 203 (100%)

    ______________________________________     Microanalysis                 C            H      N     ______________________________________     Calc        63.93        4.95   11.47     Found       64.11        5.02   11.41     Found       64.05        4.90   11.44     ______________________________________

Alternatively (3Z)-1-acetyl-3-benzylidene-2,5-piperazinedione can be produced as follows: ##STR10##

Compound 16 is treated with ammonia and subsequently with acetic anhydride to yield the title compound.

REFERENCE EXAMPLE 2 Preparation of (3Z)-1-acetyl-3-(4-acetamidobenzylidene)-2,5-piperazinedione

1,4-Diacetyl-2,5-piperazinedione (10.0 g, 50 mmol), prepared by the published procedure mentioned in Example 3, was stirred in DMF (40 ml) with 4-acetamidobenzaldehyde (8.24 g, 50 mmol) and triethylamine (7 ml, 50 mmol) and heated to 120° C. After 21/2 h the mixture was cooled to room temperature, diluted with EtOAc (100 ml) and stirred overnight. The solid formed was collected, washed with EtOAc and dried to give 8.46 g (56%) of a yellow solid.

¹ H NMR (CDCl₃ +TFA, 400 MHz) δ=2.32 (3H, s) 2.72 (3H, s) 4.68 (2H, s) 7.36 (1H, s) 7.45 (2H, d, J=8 Hz) 7.60 (2H, d, J=8 Hz)

    ______________________________________     Microanalysis                 C            H      N     ______________________________________     Calc        59.80        5.02   13.95     Found       60.08        5.09   13.89                 60.11        5.07   13.86     ______________________________________

REFERENCE EXAMPLE 3 Preparation of 1,4-Diacetyl-2,5-piperazinedione ##STR11##

1,4-Diacetyl-2,5-piperazine dione (8) was prepared by the published procedure (S. M. Marcuccio and J. A. Elix, Aust. J. Chem., 1984, 37, 1791).

REFERENCE EXAMPLE 4 (3Z)-1-Acetyl-3-(4-methoxybenzylidene)-2,5-piperazinedione ##STR12##

(3Z)-1-Acetyl-3-(4-methoxybenzylidene)-2,5-piperazinedione (9) was prepared by the published procedure (T. Yokoi, L.-M. Yang, T. Yokoi, R.-Y. Wu, and K.-H. Lee, J. Antibiot., 1988, 41, 494).

REFERENCE EXAMPLE 5 Preparation of (3Z)-1-acetyl-3-(2,6-dichlorobenzylidene)-2,5-piperazinedione

1,4-Diacetyl-2,5-piperazinedione prepared by the published procedure mentioned in Reference Example 3, was stirred in DMF with 2,6-dichlorobenzaldehyde and triethylamine and heated to 120°-130° C. for 1-3 h. The title compound was obtained with a yield of 40%.

REFERENCE EXAMPLE 6 Preparation of (3Z)-1-acetyl-3-(4-(3-dimethylamino)propoxybenzylidene)-2,5-piperazinedion

1,4-Diacetyl-2,5-piperazinedione, prepared by the published procedure mentioned in Reference Example 3, was stirred in DMF with 4-(3-dimethylamino)propoxybenzaldehyde and triethylamine and heated to 120°-130° C. for 2-4 h to give the title compound.

By the same method, using 4-(2-dimethylamino)ethoxybenzaldehyde in place of the abovementioned aldehyde, (3Z)-1-acetyl-3-(4-(2-dimethylamino)ethoxybenzylidene)-2,5-piperazinedione was prepared.

REFERENCE EXAMPLE 7 (3Z,6Z)-3-(4-Hydroxybenzylidene)-6-(4-methoxybenzylidene)-2,5-piperazinedione

(3Z,6Z)-3-(4-Acetoxybenzylidene)-6-(4-methoxybenzylidene)-2,5-piperazinedione was treated with aqueous sodium hydroxide in THF at room temperature for 8 hrs to give the title compound (1519) in 30% yield.

EXAMPLE 1

Preparation of 1470

3(Z)-1-Acetyl-3-benzylidene-2,5-piperazinedione (one equivalent), which is compound 18 prepared according to Reference Example 1, was treated with 1-tert-butoxycarbonylpyrrole-2-carboxaldehyde in the presence of Cs₂ CO₃ (1-1.1 equivalents) in DMF at 80°-100° C. for 1-6 hours. The title compound was obtained in 24% yield.

The crude product was optionally, washed with water, methanol, ethyl acetate or diethylether and optionally recrystallised from methanol as appropriate.

By the same method, but replacing 1-tert-butoxycarbonylpyrrole-2-carboxaldehyde by the appropriately substituted aldehyde or benzaldehyde, the following compounds were prepared:

    ______________________________________            Compound                    Yield (%)     ______________________________________            1471    52            1652    37            1983    45            1921    54            1922    43            1924    44            1910    31            1926    27            1927    26            1928    20            1929    --            1930    --            1912    33            5032    50            5040    45            5043    24            5053    44            5054    22            5057    43            5058    16     ______________________________________

EXAMPLE 2

Preparation of 1474

3(Z)-1-Acetyl-3-(4-methoxybenzylidene)-2,5-piperazinedione prepared according to Reference Example 4, was treated with 2-thiophenecarboxaldehyde in the presence of Cs₂ CO₃ (1-1.1 equivalents) in DMF at 80°-100° C. for 1-6 hours. The title compound was obtained in 76% yield.

By the same method, but replacing 2-thiophenecarboxaldehyde by the appropriately substituted aldehyde, the following compounds were prepared:

    ______________________________________            Compound                    Yield (%)     ______________________________________            1476    54            1479    84            1506    67            1507    7     ______________________________________

The crude product was optionally washed with water, methanol, ethyl acetate and diethylether and optionally recrystallised from acetic acid or methanol as appropriate.

EXAMPLE 3

Preparation of 1884

3(Z)-1-Acetyl-3-benzylidene-2,5-piperazinedione (1 equivalent), prepared according to Reference Example 1, was treated with cyclohexanecarboxaldehyde (4 equivalents) in the presence of 0.5M potassium tert-butoxide in tertiary butanol (2 equivalents) in DMF at 0°-100° C. for 2 hours. The title compound was obtained with a yield of 58%. Purification was effected by recrystallisation from acetic acid.

1672 was prepared as above but replacing the 3(Z)-1-acetyl-3-benzylidene-2,5-piperazinedione with 3(Z)-1-acetyl-3-(4-acetamidobenzylidene)-2,5-piperazinedione. The reaction was maintained for 18 hours. A low yield was obtained.

EXAMPLE 4

Preparation of 1676

1-Acetyl-3-(4-acetamidobenzylidene)-2,5-piperazinedione (one equivalent), prepared according to Reference Example 2, was treated with cinnamaldehyde in the presence of Cs₂ CO₃ (1-1.1 equivalents) in DMF at 80°-100° C. for 1-6 hours. The title compound was obtained in 46% yield.

EXAMPLE 5

Preparation of 1618

1,4-Diacetyl-2,5-piperazinedione, prepared by the published procedure mentioned in Reference Example 3, was stirred in DMF with 2-thiophenecarboxaldehyde (1 equivalent) and triethylamine (1 equivalent) at 120° C. for 2-4 h. (3Z)-1-Acetyl-3-(2-thenylidene)-2,5-piperazinedione was obtained with a yield of 36%.

(3Z)-1-Acetyl-3-(2-thenylidene)-2,5-piperazinedione (1 equivalent) was stirred in DMF with 3-1-tert-butoxycarbonylindole-3-carboxyaldehye (1 equivalent) in the presence of Cs₂ CO₃ (1-1.1 equivalents) at 80°-100° C. for 2-3 h. The title compound was obtained with a yield of 14%.

EXAMPLE 6

Preparation of 1542

3(Z)-1-Acetyl-3-(2,6-dichlorobenzylidene)-2,5-piperazinedione (1 equivalent), prepared according to Reference Example 5 was treated with 3-furaldehyde (1 equivalent) in the presence of Cs₂ CO₃ (1-1.1 equivalents) in DMF at 80°-100° C. for 2-5 hours. The title compound was obtained in 46% yield.

By the same method, but replacing 3-furaldehyde by the appropriately substituted aldehyde, 1560 was obtained with a yield of 39%.

EXAMPLE 7

Preparation of 1982

3(Z)-1-Acetyl-3-benzylidene-2,5-piperazinedione (1 equivalent), as prepared in Reference Example 1, was treated with 4-(N-(3-dimethylaminoethyl)-N-methyl)aminomethylbenzaldehyde in the presence of Cs₂ CO₃ (1-1.1 equivalents) in DMF at 80°-100° C. for 1-6 h to give (3Z,6Z)-3-Benzylidene-6-(4-(N-dimethylaminoethyl)-N-methyl)aminomethylbenzylidene)-2,5-piperazinedione in a yield of 50%.

Compound 1982, the hydrochloride salt of (3Z,6Z)-3-Benzylidene-6-(4-(N-(3-dimethylaminoethyl)-N-methyl)aminomethylbenzylidene)-2,5-piperazinedione, was prepared by bubbling HCl gas through a solution of the corresponding free base in THF, followed by evaporation to dryness. The yield was 45%.

EXAMPLE 8

Preparation of 1976

3(Z)-1-Acetyl-3-(4-(3-dimethylamino)propoxybenzylidene)-2,5-piperazinedione (1 equivalent), prepared according to Reference Example 6 was treated with 3-(imidazol-1-yl)benzaldehyde (1 equivalent) in the presence of Cs₂ CO₃ (1-1.1 equivalent) in DMF at 80°-90° C. for 2-4 hours. The title compound was obtained in 52% yield.

EXAMPLE 9

Preparation of 1886

1519 (1 equivalent), prepared in Reference Example 7, was treated in DMF with sodium hydride (1 equivalent) and N-phthaloylglycyl chloride (1 equivalent) in DMF at room temperature for 4 h. The title compound was obtained with a yield of 30%.

EXAMPLE 10

Preparation of 5026 ##STR13##

(3Z)-1-acetyl-3-(4-(3-dimethylamino)propoxybenzylidene)-2,5-piperazinedione, prepared as in Reference Example 6, was treated with compound 10.1 in dimethylformamide (DMF) in the presence of Cs₂ CO₃ at a temperature of 80° C.-90° C. for 2-4 hours. Compound 5026 was obtained in 95% yield.

By an analogous process, using the appropriately substituted benzaldehyde in place of compound 10.1, the following compounds were prepared:

    ______________________________________            Compound No.                     Yield %     ______________________________________            5030     30            5048     72            5188     70     ______________________________________

EXAMPLE 11

Preparation of 5027 ##STR14##

(3Z)-1-acetyl-3-(4-(3-dimethylamino)propoxybenzylidene)-2,5-piperazinedione, prepared as in Reference Example 6, was treated with compound 11.1 in DMF in the presence of Cs₂ CO₃ at 80° C.-90° C. for 2-4 hours. Compound 5027 was produced in 33% yield.

By the same method, but replacing 11.1 by the appropriately substituted aldehyde, the following compounds were prepared:

    ______________________________________     Compound No.   Yield (%)     ______________________________________     5028           44     5029           25     5041           39     5042           39     5046           37     5052           58     ______________________________________

EXAMPLE 12

Preparation of 5023 ##STR15##

Compound 12.1 was treated with 4-(3-dimethylamino)propoxybenzaldehyde in DMF in the presence of Cs₂ CO₃ at a temperature of 80° C.-90° C. for 2-4 hours. Compound 5023 was obtained in 36% yield.

EXAMPLE 13 Preparation of 5062 ##STR16##

(3Z)-1-acetyl-3-(4-(2-dimethylamino)ethoxybenzylidene)-2,5-piperazinedione, prepared as in Reference Example 6, was treated with compound 13.1 in DMF in the presence of Cs₂ CO₃ at a temperature of 80° C.-90° C. for 2-4 hours. Compound 5062 was obtained in 12% yield.

By the same method, but using the appropriately substituted aldehyde in place of compound 13.1, the following compounds were prepared:

    ______________________________________     Compound No.   Yield (%)     ______________________________________     5071           41     5072           86     ______________________________________

EXAMPLE 14

Preparation of compounds of formula (I) ##STR17##

The 2,5-piperazinedione derivative 14.1 was treated with the aldehyde 14.2, the groups Ar and Subst. being as specified below, in DMF in the presence of Cs₂ CO₃ at 80° C.-90° C. for 2-4 hours. The compounds of formula (I) listed below were prepared:

    ______________________________________                              Compound                              of formula     Ar       Subst.          (I)       Yield (%)     ______________________________________     Phenyl   --CH.sub.2 S(CH.sub.2).sub.2 NMe.sub.2                              5058      16     3-furyl  --CH.sub.2 S(CH.sub.2).sub.2 NMe.sub.2                              5073      33     3-thienyl              --CH.sub.2 S(CH.sub.2).sub.2 NMe.sub.2                              5078      38     3-thienyl              --CH.sub.2 NHC(O)CH.sub.2 NMe.sub.2                              5074      83     2-bromophenyl              --CH.sub.2 NHC(O)CH.sub.2 NMe.sub.2                              5079      28     3-furyl  --CH.sub.2 NHC(O)CH.sub.2 NMe.sub.2                              5081      68     3-thienyl              --CH.sub.2 O(CH.sub.2).sub.2 NMe.sub.2                              5069      29     3-furyl  --CH.sub.2 O(CH.sub.2).sub.2 NMe.sub.2                              5077      20     ______________________________________

EXAMPLE 15

Preparation of compounds of formula (I) ##STR18##

The 2,5-piperazinedione derivative 15.1 was treated with the aldehyde 15.2 in which R₂₀ and R₂₁ are both H or are both OMe, the substituent Ar and linking group A being as specified below, in DMF in the presence of Cs₂ CO₃ at 80° C. to 90° C. for 2-4 hours. The compounds of formula (I) listed below were prepared. In 5391, 5394 and 5371 R₂₀ and R₂₁ are both H. In 5393 and 5402 R₂₀ and R₂₁ are OMe.

    ______________________________________                              Compound                              of Formula     Ar       A               (I)        Yield (%)     ______________________________________     Phenyl   (CH.sub.2).sub.2                              5391       21     Phenyl   (CH.sub.2).sub.3                              5394       47     Phenyl   (CH.sub.2).sub.4                              5371       56     Phenyl               ##STR19##      5393       44     4-nitrophenyl               ##STR20##      5402       62     ______________________________________

EXAMPLE 16

Preparation of compounds of formula (I) ##STR21##

(3Z)-1-acetyl-3-benzylidene-2,5-dione prepared as in Reference Example 1 (compound 18), was treated with the aldehyde 16.1 in which substituent Y was as indicated below, in DMF in the presence of Cs₂ CO₃ at 80° C.-90° C. for 2-4 hours. The compounds of formula (I) listed below were prepared:

    ______________________________________                      Compound of     Y                formula (I)                                 Yield %)     ______________________________________     5-O(CH.sub.2).sub.2 NMe.sub.2                      5324       34     4-O(CH.sub.2).sub.2 NMe.sub.2                      5327       51     5-(CH.sub.2).sub.2 NMe.sub.2                      5335       45     5-O(CH.sub.2).sub.2 O(CH.sub.2).sub.2 NMe.sub.2                      5388       12     5-O(CH.sub.2).sub.6 NMe.sub.2                      5389       35     5-N(Me)(CH.sub.2).sub.2 NMe.sub.2                      5299       2     ______________________________________

By the same method, but using 2,5-dichlorothiophene-4-carboxaldehyde in place of compound 16.1, 5075 was prepared in 31% yield.

EXAMPLE 17

Preparation of salts

1. Hydrochloride salts of the following compounds of formula (I) were prepared by bubbling HCl gas through a solution of the corresponding free base in tetrahydrofuran (THF) at room temperature. The salt was recovered in the yield indicated.

    ______________________________________     Compound of    Hydrochloride     formula (I)    salt       Yield (%)     ______________________________________     1975           5026       95     1976           5030       30     5048           5048.HCl   72     5188           5206       24     5200           5205       31     5367           5376       47     5397           5397.2HCl  36     5041           5041.HCl   63     5042           5042.HCl   51     5046           5046.HCl   32     5052           5052.HCl   58     5023           1988       50     5062           5062.HCl   --     5071           5071.HCl   --     5072           5072.HCl   --     1910           5055       57     1912           5061       47     5032           5032.HCl   39     5053           5053.HCl   90     5054           5053.HCl   88     5073           5073.HCl   76     5078           5078.HCl   78     1912           5061       47     5074           5074.HCl   51     5079           5079.HCl   73     5081           5081.HCl   76     5069           5069.HCl   --     5077           5077.HCl   --     5324           5324.HCl   68     5336           5336.HCl   74     5335           5335.HCl   --     5388           5388.HCl   79     5389           5389.HCl   75     5391           5391.HCl   --     5394           5394.HCl   75     5371           5379       65     ______________________________________

2. Hydrochloride salts of the following compounds of formula (I) were prepared by bubbling HCl gas through a solution of the corresponding free base in hot DMF. The salt was recovered in the yield indicated.

    ______________________________________     Compound of     Hydrochloride     formula (I)     salt       Yield     ______________________________________     5386            5386.2HCl  79     5393            5393.HCl   60     5402            5402.HCl   52     ______________________________________

3. Hydrochloride salts of the following compounds of formula (I) were prepared by treating the free base with 2M HCl:

    ______________________________________     Compound of    Hydrochloride     formula (I)    salt       Yield (%)     ______________________________________     5027           5027.HCl   67     5028           5028.HCl   92     5029           5029.HCl   76     5040           5040.HCl   90     ______________________________________

4. 5043.HCl, the hydrochloride salt of 5043, was prepared by bubbling HCl gas through a solution of 5043 in MeOH. 5057.HCl, the salt of 5057, was prepared by bubbling HCl gas through a solution of 5057 in THF following by recrystallisation from MeOH.

EXAMPLE 18

PHARMACEUTICAL COMPOSITION

Tablets, each weighing 0.15 g and containing 25 mg of a compound of the invention can be manufactured as follows:

Composition for 10,000 tablets

compound of the invention (250 g)

lactose (800 g)

corn starch (415 g)

talc powder (30 g)

magnesium stearate (5 g)

The compound of the invention, lactose and half of the corn starch are mixed. The mixture is then forced through a sieve 0.5 mm mesh size. Corn starch (10 g) is suspended in warm water (90 ml). The resulting paste is used to granulate the powder. The granulate is dried and broken up into small fragments on a sieve of 1.4 mm mesh size. The remaining quantity of starch, talc and magnesium stearate is added, carefully mixed and processed into tablets.

EXAMPLE 19

Characterisation of compounds of formula A

The compounds prepared in the preceding Examples, were characterised by mass spectroscopic, microanalytical, proton nuclear magnetic resonance and, in some cases, infra-red techniques. The results are set out in the Tables which follow:

    __________________________________________________________________________                    Mass spec. data                    mass    .sup.1 H nmr data     No.   Mol. Formula                    (intensiy)                         mode                            solvent (field)                                         δ     __________________________________________________________________________     1910  C.sub.23 H.sub.20 N.sub.4 O.sub.3                    401(100)                         CI d.sub.6 -DMSO/400 MHz                                         4.28-4.32(2H, t), 4.35-4.40(2H, t),                                         6.75-7.70(14H, m), 10.15(2H, brs).     5023  C.sub.26 H.sub.32 N.sub.4 O.sub.3                    449(100)                         EI CDCl.sub.3 /400 MHz                                         2.00(2H, m), 2.25(12H, s), 2.46(2H,                                         t),                                         3.45(2H, s), 4.05(2H, t), 6.95-7.42                                         (10H, m), 8.15(2H, brs).     5026  C.sub.27 H.sub.29 N.sub.5 O.sub.3.2HCl                            d.sub.6 -DMSO/400 MHz                                         2.12(2H, m), 2.73(6H, s), .21(2H,                                         m),                                         4.11(2H, t), 5.48(2H, s), 6.76(2H,                                         s),                                         7.00(2H, d), 7.47(2H, d), 7.50(2H,                                         d),                                         7.55(2H, d), 7.65(1H, s), 7.77(1H,                                         s),                                         9.21(1H, s), 10.12(2H, brs), 10.45                                         (1H, brs).     5027  C.sub.22 H.sub.24 N.sub.4 O.sub.3.2HCl                            CDCl.sub.3 + CF.sub.3 CO.sub.2 H/400                                         2.00(2H, t), 3.00(6H, s), 3.45(2H,                                         m),                                         3.90(2H, t), 7.00(2H, d), 7.15(1H,                                         s),                                         7.35(1H, s), 7.45(2H, d), 8.00(2H,                                         d),                                         8.95(2H, d).     5028  C.sub.22 H.sub.24 N.sub.4 O.sub.3.2HCl                            CDCl.sub.3 + CF.sub.3 CO.sub.2 D/400                                         2.35(2H, m), 3.00(6H, s), 3.45(2H,                                         t),                                         4.15(2H, t), 7.00(2H, d), 7.15(1H,                                         s),                                         7.30(1H, s), 7.45(2H, d), 8.10(1H,                                         t),                                         8.50(1H, d), 8.95(1H, d), 9.15(1H,                                         s).     5030                   d.sub.6 -DMSO/400 MHz                                         2.18(2H, m), 2.77(6H, s), 3.20(2H,                                         m),                                         4.10(2H, t), 6.77(1H, s), 6.81(1H,                                         s),                                         7.00(2H, d), 7.51(2H, d), 7.65(2H,                                         m),                                         7.71(1H, m), 7.85(1H, s), 7.96(1H,                                         s),                                         8.29(1H, s), 9.60(1H, s), 10.21                                         (1H, brs), 10.50(1H, brs), 10.61                                         (1H, brs).     5032  C.sub.23 H.sub.25 N.sub.3 O.sub.4.HCl                    408(20),                         CI d.sub.6 -DMSO/400 MHz                                         2.83(6H, s), 3.23(2H, m), 4.02(2H,                                         d),                    306(30)              4.30(1H, m), 5.96(1H, brd), 6.77(1H,                                         s),                                         6.78(1H, s), 7.02(2H, d), 7.33(1H,                                         m),                                         7.42(2H, m), 7.55(4H, m), 9.70(1H,                                         brs),                                         10.12(2H, br).     5040  C.sub.25 H.sub.27 N.sub.3 O.sub.5.HCl                    450(10)                         CI d.sub.6 -DMSO/400 MHz                                         3.20-3.55(6H, m), 3.75-4.00(4H, m),                                         4.02                                         (2H, d), 4.39(1H, m), 5.99(1H, brs),                                         6.77                                         (1H, s), 6.78(1H, s), 7.02(2H, d),                                         7.33                                         (1H, m), 7.45(2H, m), 7.55(4H, m),                                         10.20                                         (3H, br)     5041  C.sub.21 H.sub.23 N.sub.3 O.sub.4.HCl                    382(100)                         EI d.sub.6 -DMSO/400 MHz                                         2.09(2H, m), 2.80(6H, s), 3.20(2H,                                         m),                                         4.09(2H, t), 6.63(1H, s), 6.64(1H,                                         m),                                         6.78(1H, s), 6.89(1H, m), 7.0(2H,                                         d),                                         7.54(2H, d), 7.90(1H, s), 9.45(1H,                                         brs),                                         9.75(1H, brs), 10.14(1H, brs)     5042  C.sub.21 H.sub.23 N.sub.3 O.sub.3 S.HCl                    398(35)                         EI d.sub.6 -DMSO/400 MHz                                         2.09(2H, m), 2.79(6H, s), 3.18(2H,                                         m),                                         4.10(2H, t), 6.76(1H, s), 6.85(1H,                                         s),                                         7.00(2H, d), 7.41(1H, m), 7.51(2H,                                         d),                                         7.62(1H, m), 7.94(1H, m), 9.89(1H,                                         brs),                                         9.92(1H, brs), 10.10(1H, brs).     5043  C.sub.27 H.sub.32 N.sub.4 O.sub.5.HCl                    493(100)                         CI d.sub.6 -DMSO/400 MHz                                         3.01-3.85(14H, m), 4.02(2H, d), 4.40                                         (1H, brs), 6.77(1H, s), 6.78(1H, s),                                         7.02                                         (2H, d), 7.32(1H, m), 7.42(2H, m),                                         7.55                                         (4H, m), 10.20(2H, s).     5046  C.sub.21 H.sub.23 N.sub.3 O.sub.3 S.HCl                    398(23),                         EI d.sub.6 -DMSO/400 MHz                                         2.09(2H, m), 7.28(6H, s), 3.12(2H,                                         m),                    169(100)             4.10(2H, t), 6.78(1H, s), 6.94(1H,                                         s),                                         7.00(2H, d), 7.18(1H, m), 7.54(2H,                                         d)                                         7.58(1H, m), 7.76(1H, m), 9.75(1H,                                         brs),                                         10.16(1H, brs).     5048  C.sub.25 H.sub.28 N.sub.4 O.sub.4.HCl                    485(100)                         EI d.sub.6 -DMSO/400 MHz                                         2.05(2H, s), 2.14(2H, m), 2.79(6H,                                         d),                                         3.20(2H, m), 4.13(2H, t), 6.70(1H,                                         s),                                         6.75(1H, s), 7.0(2H, d), 7.48(2H,                                         d),                                         7.51(2H, d), 7.62(2H, d), 9.94(1H,                                         brs),                                         10.15(1H, brs), 10.20(1H, brs).     5052                   d.sub.6 -DMSO/400 MHz                                         2.15(2H, m), 2.28(6H, s), 3.20(2H,                                         m),                                         4.10(2H, t), 6.68(1H, s), 6.75(1H,                                         s),                                         6.94(1H, s), 7.00(2H, d), 7.54(2H,                                         d),                                         7.76(1H, s), 8.23(1H, s).     5053  C.sub.24 H.sub.25 N.sub.3 O.sub.3.HCl                            CDCl.sub.3 + CF.sub.3 CO.sub.2 D/400                                         2.20(4H, m), 3.20(2H, m), 3.70(2H,                                         m),                                         4.00(2H, m), 4.45(2H, m), 7.00(2H,                                         d),                                         7.23(1H, s), 7.39(1H, s), 7.45(7H,                                         m).     5054  C.sub.24 H.sub.25 N.sub.3 O.sub.4.HCl                            CDCl.sub.3 + CF.sub.3 CO.sub.2 D/400                                         3.25(2H, m), 3.67(2H, m), 3.85(2H,                                         m),                                         4.05-4.20(4H, m), 4.47(2H, m), 6.97                                         (2H, d) 7.20(1H, s), 7.26(1H, s),                                         7.39-                                         7.51(7H, m).     5055  C.sub.23 H.sub.20 N.sub.4 O.sub.3.HCl                    401(100)                         ESI                            d.sub.6 -DMSO/400 MHz                                         4.40(2H, t), 4.60(2H, t), 6.73(1H,                                         s),                                         6.75(1H, s), 6.99(2H, d), 7.30-7.55                                         (7H, m), 7.65(1H, s), 7.90(1H, s),                                         9.10                                         (1H, s), 10.10(1H, s), 10.15(1H, s),                                         10.20(1H, brs)     5057  C.sub.24 H.sub.22 N.sub.4 O.sub.4.HCl                            d.sub.6 -DMSO/400 MHz                                         4.00-4.05(2H, m), 4.20-4.32(2H, m),                                         4.48                                         (1H, m), 6.77(1H, s), 6.78(1H, s),                                         7.03                                         (2H, d), 7.32(2H, m), 7.42(2H, m),                                         7.55                                         (4H, m), 7.71(1H, m), 7.77(1H, m),                                         9.12                                         (1H, s), 10.20(2H, brs).     5058.HCl           C.sub.23 H.sub.25 N.sub.3 O.sub.2 S.HCl                    409(15)                         CI d.sub.6 -DMSO/400 MHZ                                         2.70-2.75(8H, m), 3.20-3.25(2H, m),                                         3.85                                         (2H, s), 6.78(2H, s), 7.32-7.55(9H,                                         m),                                         9.68(1H, brs), 10.22(1H, s), 10.24                                         (1H, s)     5061  C.sub.23 H.sub.24 N.sub.4 O.sub.3.HCl                            d.sub.6 -DMSO/400 MHz                                         2.84(6H, s), 3.95(2H, s), 4.40(2H,                                         d),                                         6.75(1H, s), 6.77(1H, s), 7.33-7.55                                         (9H, m), 9.15(1H, t), 9.85(1H, brs),                                         10.20(1H, brs), 10.25(1H, brs).     5062  C.sub.20 H.sub.21 N.sub.3 O.sub.4.HCl                            d.sub.6 -DMSO/400 MHz                                         2.76(6H, d), 3.51(2H, m), 4.38(2H,                                         t),                                         6.66(1H, s), 6.75(1H, s), 6.91(1H,                                         s),                                         7.05(2H, d), 7.55(2H, d), 7.74(1H,                                         s),                                         8.22(1H, s), 9.76(1H, s).     5069  C.sub.21 H.sub.23 N.sub.3 O.sub.3 S.HCl                    397(10)                         CI d.sub.6 -DMSO/400 MHz                                         2.80(6H, s), 3.30(2H, t), 3.76.(2H,                                         t),                                         4.58(2H, s), 6.82(1H, s), 6.87(1H,                                         s),                                         7.45(2H, m), 7.58(2H, d), 7.65(1H,                                         m),                                         8.00(1H, s), 9.78(1H, s), 10.02(1H,                                         s),                                         10.18(1H, s).     5071  C.sub.20 H.sub.21 N.sub.3 O.sub.3 S.HCl                            d.sub.6 -DMSO/400 MHz                                         2.86(6H, d), 3.53(2H, m), 4.38(2H,                                         t),                                         6.78(1H, s), 6.84(1H, s), 7.07(2H,                                         d),                                         7.43(1H, m), 7.58(2H, d), 7.65(1H,                                         m),                                         7.96(1H, m), 9.55(1H, s), 10.05                                         (1H, brs), 10.13(1H, brs).     5072  C.sub.21 H.sub.23 N.sub.3 O.sub.3 S.sub.2.HCl                            d.sub.6 -DMSO/400 MHz                                         2.58(3H, s), 2.78(6H, s), 3.44(2H,                                         m),                                         4.36(2H, t), 6.77(1H, s), 6.85(1H,                                         s),                                         7.05(2H, d), 7.12(1H, d), 7.52(1H,                                         d),                                         7.58(2H, d), 10.20(1H, s)     5073  C.sub.21 H.sub.23 N.sub.3 O.sub.3 S                    398(15),                         EI CDCl.sub.3 + CF.sub.3 CO.sub.2 D/400                                         2.75(2H, t), 2.90(6H, s), 3.25(2H,                                         t),                    293(100)             3.78(2H, s), 6.70(1H, s), 7.10(1H,                                         s),                                         7.40(4H, s), 7.60(1H, s), 7.85(1H,                                         s).     5073.HCl           C.sub.21 H.sub.23 N.sub.3 O.sub.3 S.HCl                            d.sub.6 -DMSO/400 MHz                                         2.75(6H, s), 2.75-2.80(2H, m), 3.20                                         (2H, m), 3.84(2H, s), 6.70(1H, s),                                         6.77                                         (1H, s), 6.90(1H, s), 7.40(2H, d),                                         7.52                                         (2H, d), 7.75(1H, s), 8.20(1H, s),                                         9.78                                         (1H, brs), 10.00(1H, brs), 10.00(1H,                                         brs)     5074                   d.sub.6 -DMSO/400 MHz                                         2.82(6H, s), 4.00(2H, s), 4.41(2H,                                         d),                                         6.81(1H, s), 6.88(1H, s), 7.98(2H,                                         m),                                         9.15(1H, brs), 9.90(1H, brs), 10.04                                         (1H, brs), 10.18(1H, brs).     5075  C.sub.16 H.sub.10 C.sub.12 N.sub.2 O.sub.2 S                            d.sub.6 -DMSO/400 MHz                                         6.50(1H, s), 6.80(1H, s), 7.35(1H,                                         t),                                         7.39-7.45(3H, m), 7.55(2H, d).     5077  C.sub.21 H.sub.23 N.sub.3 O.sub.4.HCl                            d.sub.6 -DMSO/400 MHz                                         2.55(2H, t), 2.80(6H, s), 3.80(2H,                                         t),                                         4.55(2H, s), 6.70(1H, s), 6.80(1H,                                         s),                                         6.95(1H, s), 7.45(2H, d), 7.60(2H,                                         d),                                         7.85(1H, s), 8.30(1H, s), 9.90(1H,                                         s),                                         10.00(1H, s).     5078  C.sub.21 H.sub.23 N.sub.3 O.sub.2 S.sub.2                    414(15),                         EI CDCl.sub.3 + CF.sub.3 CO.sub.2 D/400                                         2.75(2H, t), 2.88(6H, s), 3.25(2H,                                         t),                    309(100)             3.88(2H, s), 7.22-7.28(3H, m), 7.45                                         (4H, s), 7.50-7.54(1H, m),                                         7.64)-7.66                                         (1H, s).     5078. HCl           C.sub.12 H.sub.23 N.sub.3 O.sub.2 S.sub.2.HCl                            d.sub.6 -DMSO/400 MHz                                         2.72-2.78(2H, m), 2.75(6H, s),                                         3.20-3.25                                         (2H, m), 3.84(2H, s), 6.75(1H, s),                                         6.85                                         (1H, s), 7.40-7.45(3H, m), 7.55(2H,                                         d),                                         7.64-7.67(1H, m), 7.96-7.99(1H, m),                                         9.85                                         (1H, brs), 10.05(1H, brs), 10.18                                         (1H, brs).     5079  C.sub.23 H.sub.23 BrN.sub.4 O.sub.3.HCl                            d.sub.6 -DMSO/400 MHz                                         2.82(6H, s), 4.00(2H, s), 4.41(2H,                                         d),                                         6.74(1H, s), 6.80(1H, s), 7.30(1H,                                         m),                                         7.36(2H, d), 7.45(1H, m), 7.54(2H,                                         d),                                         7.60(1H, d), 7.68(1H, d), 9.56(1H,                                         brt),                                         9.90(1H, brs), 10.36(1H, brs), 10.48                                         (1H, brs).     5081  C.sub.21 H.sub.22 N.sub.4 O.sub.4.HCl                            d.sub.6 -DMSO/400 MHz                                         2.83(6H, s), 4.01(2H, s), 4.39(2H,                                         d),                                         6.68(1H, s), 6.79(1H, s), 6.94(1H,                                         s),                                         7.35(2H, d), 7.54(2H, d), 7.76(1H,                                         s),                                         8.22(1H, s), 9.12(1H, brt), 9.82                                         (2H, brs), 10.12(1H, brs).     5188  C.sub.27 H.sub.27 N.sub.3 O.sub.3                    442(100)                         ESI                            d.sub.6 -DMSO/400 MHz                                         1.8-1.9(2H, m), 2.15(6H, s), 2.38                                         (2H, t), 4.05(2H, t), 6.78(1H, s),                                         6.90                                         (1H, s), 6.99(2H, d), 7.50-7.58(4H,                                         m),                                         7.61-7.65(1H, m), 7.39-7.98(3H, m),                                         8.11                                         (1H, s), 10.28(2H, brs).     5200  C.sub.27 H.sub.27 N.sub.3 O.sub.3                    442(100)                         ESI                            d.sub.6 -DMSO/400 MHz                                         1.81-1.91(2H, m), 2.15(6H, s), 2.35                                         (2H, t), 4.09(2H, t), 6.75(1H, s),                                         6.96                                         (2H, d), 7.21(1H, s), 7.5-7.65(7H,                                         m),                                         7.94(2H, d), 10.15(2H, brs).     5205  C.sub.27 H.sub.27 N.sub.3 O.sub.3.HCl                    442(40)                         CI d.sub.6 -DMSO/400 MHz                                         2.12-2.20(2H, m), 2.80(6H, s),                                         3.20-3.25                                         (2H, m), 4.10(2H, t), 6.75(1H, s),                                         7.01                                         (2H, d), 7.24(1H, s), 7.51-7.67(6H,                                         m),                                         7.92(2H, d), 7.98-8.01(1H, m), 10.1                                         (2H, brs), 10.25(1H, brs).     5206  C.sub.27 H.sub.27 N.sub.3 O.sub.3.HCl                            d.sub.6 -DMSO/400 MHz                                         2.11-2.21(2H, m), 2.60(6H, s),                                         2.85-2.98                                         (2H, m), 4.09(2H, t), 6.78(1H, s),                                         6.94                                         (1H, s), 7.0(2H, d), 7.50-7.59(4H,                                         m),                                         7.64(1H, d), 7.90-7.99(3H, m), 8.12                                         (1H, m), 10.21(1H, brs), 10.43(1H,                                         brs).     5324  C.sub.20 H.sub.21 N.sub.3 O.sub.3 S.HCl                    384(100)                         CI d.sub.6 -DMSO/400 MHz                                         2.85(6H, s), 3.52(2H, t), 4.50(2H,                                         t),                                         6.52(1H, d), 6.78(1H, s), 6.81 (1H,                                         s),                                         7.31(1H, d), 7.32(1H, m), 7.45(2H,                                         m)                                         7.57(2H, d), 9.70(1H, s), 10.15(1H,                                         s),                                         10.41(1H, brs).     5327  C.sub.20 H.sub.21 N.sub.3 O.sub.3 S                    384(20)                         CI d.sub.6 -DMSO/400 MHz                                         2.22(6H, s), 2.63(2H, t), 4.05(2H,                                         t),                                         6.76(1H, s), 6.82(2x1H, s), 7.30(1H,                                         s),                                         7.33(1H, m), 7.42(2H, m), 7.55(2H,                                         d).     5335  C.sub.20 H.sub.21 N.sub.3 O.sub.2 S.HCl                    368(20)                         CI d.sub.6 -DMSO/400 MHz                                         2.78(6H, s), 3.28(4H, m), 6.78(1H,                                         s),                                         6.89(1H, s), 7.02(1H, d), 7.38-7.45                                         (4H, m), 7.55(2H, d), 9.68(1H, brs),                                         10.40(1H, br).     5336  C.sub.20 H.sub.21 N.sub.3 O.sub.3 S.HCl                    384(10)                         CI d.sub.6 -DMSO/400 MHz                                         2.82(6H, s), 3.49(2H, t), 4.38(2H,                                         t),                                         6.78(1H, s), 6.80(1H, s), 6.94(1H,                                         s),                                         7.31(1H, s), 7.32(1H, m), 7.42(2H,                                         m),                                         7.55(2H, d), 9.78(1H, s), 10.25(1H,                                         s),                                         10.45(1H, brs).     5367  C.sub.33 H.sub.34 N.sub.4 O.sub.4                    551(100)                         CI CDCl.sub.3 + CF.sub.3 CO.sub.2 D/400                                         1.72(2H, m), 1.95-2.01(2H, m), 2.24                                         (6H, m), 2.48(2H, t), 2.96(2H, m),                                         3.70                                         (1H, m), 4.07(2H, t), 4.89(1H, m),                                         7.0                                         (2H, d), 7.01((2H, s), 7.15-7.25(4H,                                         m),                                         7.35(2H, d), 7.48(2H, d), 7.57(2H,                                         d),                                         8.17(2H, brs).     5371  C.sub.32 H.sub.32 N.sub.4 O.sub.3                    521(100)                         CI CDCl.sub.3 /400 MHz                                         1.75-1.80(4H, m), 2.55-2.60(2H, m),                                         2.75                                         (2H, t), 2.88(2H, t), 3.50-3.55(2H,                                         m),                                         3.65(2H, s), 6.95(1H, s), 6.98-7.02                                         (1H, m), 7.05-7.10(4H, m), 7.15-7.20                                         (2H, m) 7.38-7.50(5H, m), 7.65(2H,                                         d),                                         7.85(1H, brs), 8.00(1H, brs), 8.15                                         (1H, brs).     5379  C.sub.32 H.sub.32 N.sub.4 O.sub.3.HCl                            d.sub.6 -DMSO/400 MHz                                         1.60-1.68(2H, m), 1.80-1.88(2H, m),                                         3.00-3.06(1H, m), 3.15-3.35(6H, m),                                         3.65-                                         3.75(1H, m), 4.25-4.55(2H, m), 6.80                                         (2H, brs), 7.18-7.45(7H, m),                                         7.55-7.65                                         (4H, m), 7.89(2H, d), 8.57(1H, brs),                                         10.29(2H, brs), 10.36(1H, brs).     5386  C.sub.35 H.sub.39 N.sub.5 O.sub.4                    594(100),                         ESI                            d.sub.6 -DMSO/400 MHz                                         1.81-1.90(2H, m), 2.15(6H, s), 2.35                    97(50)               (2H, t), 2.62-2.70(2H, m), 2.79-2.83                                         (2H, m), 3.46-3.53(2H, m), 4.02(2H,                                         t),                                         6.73(1H, s), 6.75(1H, s), 6.73(1H,                                         s),                                         6.75(1H, s), 6.98(2H, d), 7.02-7.11                                         (4H, m) 7.50(2H, d), 7.60(2H, d),                                         7.78                                         (2H, d), 8.41-8.48(1H, m), 10.22(1H,                                         brs)     5386.2HCl           C.sub.35 H.sub.39 N.sub.5 O.sub.4.2HCl                    594(100),                         ESI                            d.sub.6 -DMSO/400 MHz                                         2.12-2.21(2H, m), 2.72(6H, s),                                         3.1-3.25                    297(58)              (4H, m), 3.76-3.82(2H, m), 4.12(2H,                                         t),                                         4.41(2H, brs), 6.78(1H, s), 6.79(1H,                                         s),                                         7.02(2H, d), 9.05(1H, brs), 10.19                                         (1H, brs), 10.35(1H, brs).     5388  C.sub.22 H.sub.25 N.sub.3 O.sub.4 S                            d.sub.6 -DMSO/400 MHz                                         2.16(6H, s), 2.42(2H, t), 3.55(2H,                                         t),                                         3.75(2H, t), 4.23(2H, t), 6.43(1H,                                         d),                                         6.72(1H, s), 6.78(1H, s), 7.22(1H,                                         d),                                         7.32(1H, m), 7.42(2H, m), 7.53(2H,                                         d).     5388.HCl           C.sub.22 H.sub.25 N.sub.3 O.sub.4 S.HCl                    428(5)                         CI d.sub.6 -DMSO/400 MHz                                         2.72(6H, s), 3.25(2H, t), 3.81(4H,                                         m),                                         4.32(2H, t), 6.47(1H, d), 6.76(1H,                                         s),                                         6.81(1H, s), 7.27(1H, d), 7.32(1H,                                         m),                                         7.42(2H, m), 7.55(2H, d), 10.15                                         (1H, brs).     5389  C.sub.24 H.sub.29 N.sub.3 O.sub.3 S                    440(5)                         CI d.sub.6 -dMSO/400 MHz                                         1.28-1.45(6H, m), 1.57(2H, m), 2.12                                         (6H, s), 2.20(2H, t), 4.13(2H, t),                                         6.41                                         (1H, d), 6.75(1H, s), 6.79(1H, s),                                         7.23                                         (1H, d), 7.32(1H, m), 7.42(2H, m),                                         7.55                                         (2H, d).     5389.HCl           C.sub.24 H.sub.29 N.sub.3 O.sub.3 S.HCl                    440(5)                         CI d.sub.6 -DMSD/400 MHz                                         1.36(2H, m), 1.45(2H, m), 1.66(2H,                                         m),                                         1.76(2H, m), 2.72(6H, s), 30..(2H,                                         t),                                         4.13(2H, t), 6.42(1H, d), 6.75(1H,                                         s),                                         6.80(1H, s), 7.25(1H, d), 7.32(1H,                                         m),                                         7.41(2H, m), 7.55(2H, d), 10.06                                         (3H, brs).     5391  C.sub.30 H.sub.28 N.sub.4 O.sub.3                    493(100),                         ESI                            CDCl.sub.3 + CF.sub.3 CO.sub.2 D/400                                         3.15-3.25(1H, m), 3.28-3.40(1H, m),                    489(50)              3.48-3.57(1H, m), 3.60-3.68(2H, m),                                         3.92-4.02(3H, m), 4.33(2H, d), 4.77                                         (1H, d), 7.11(1H, d), 7.22-7.56(12H,                                         m),                                         7.85(2H, d).     5391.HCl           C.sub.30 H.sub.28 N.sub.4 O.sub.3.HCl                    493(100)                         ESI                            d.sub.6 -DMSO/400 MHZ                                         3.01-3.10(1H, m), 3.38-3.45(4H, m),                                         3.80-3.85(3H, m), 4.32-4.41(1H, m),                                         4.61-4.70(1H, m), 6.80(2H, s),                                         7.18-7.36                                         (5H, m), 7.41(2H, t), 7.58(2H, d),                                         7.67                                         (2H, d), 7.99(2H, d), 9.02(1H, t),                                         10.29                                         (1H, brs), 10.39(1H, brs), 10.99                                         (1H, brs).     5393  C.sub.38 H.sub.36 N.sub.4 O.sub.5                            d.sub.6 -DMSO/400 MHz                                         2.70(6H, m), 2.80(2H, m), 3.55(2H,                                         s),                                         3.70(6H, s), 6.63(1H, s), 6.65(1H,                                         s),                                         6.80(1H, s), 6.83(1H, s), 7.22(2H,                                         d),                                         7.32(1H, m), 7.42(2H, m), 7.55(2H,                                         d),                                         7.68(4H, d), 7.99(2H, d), 10.15(1H,                                         s),                                         10.35(2H, br).     5393.HCl           C.sub.38 H.sub.36 N.sub.4 O.sub.5.HCl                    629(100)                         CI d.sub.6 -DMSO/400 MHz                                         2.95-3.45(8H, m), 3.75(2x3H, s),                                         4.25-                                         4.50(2H, m), 6.79(1H, s), 6.80(1H,                                         s),                                         6.82(1H, s), 6.83(1H, s), 7.30(2H,                                         d),                                         7.32(1H, m), 7.41(2H, m), 7.55(2H,                                         d),                                         7.68(2H, d), 7.77(2H, d), 8.01(2H,                                         d),                                         10.28(2H, s), 10.40(1H, s), 10.80                                         (1H, brs).     5394  C.sub.31 H.sub.30 N.sub.4 O.sub.3                    507(15)                         CI d.sub.6 -DMSO/400 MHz                                         1.75-1.85(2H, m), 2.52-2.57(2H, m),                                         2.67                                         (2H, t), 2.84(2H, t), 3.34-3.40(2H,                                         m),                                         3.57(2H, s), 6.75(1H, s), 6.80(1H,                                         s),                                         7.05-7.10(4H, m), 7.30-7.55(7H, m),                                         7.84                                         (2H, d), 8.57(1H, brt), 10.25(2H,                                         brs).     5394. HCl           C.sub.31 H.sub.30 N.sub.4 O.sub.3.HCl                            d.sub.6 -DMSO/400 MHz                                         2.02-2.10(2H, m), 2.95-3.01(1H, m),                                         3.18-3.43(6H, m), 3.65-3.70(1H, m),                                         4.23-4.53(2H, m), 6.79(1H, s), 6.81                                         (1H, s), 7.20-7.45(7H, m) 7.55(2H,                                         d),                                         7.65(2H, d), 7.90(2H, d), 8.70(1H,                                         t),                                         10.25(1H, s), 10.35(1H, s), 10.60                                         (1H, brs).     5397  C.sub.37 H.sub.43 N.sub.5 O.sub.4                    622(80)                         CI CDCl.sub.3 /400 MHz                                         1.75-1.83(4H, m), 1.95-2.00(2H, m),                                         2.25                                         (6H, s), 2.45(2H, t), 2.58-2.61 (2H,                                         m),                                         2.75(2H, t), 2.85-2.90(2H, m),                                         3.47-3.52                                         (2H, m), 3.62(2H, s), 4.05(2H, t),                                         6.90                                         (1H, s), 6.95-7.20(10H, m), 7.35(2H,                                         d),                                         7.65(1H, d), 7.83(1H, brs), 8.15                                         (1H, brs).     5397.2HCl           C.sub.37 H.sub.43 N.sub.5 O.sub.4.2HCl                            d.sub.6 -DMSO/400 MHz                                         1.60-1.65(2H, m), 1.82-1.90(2H, m),                                         2.12-2.20(2H, m), 2.79(6H, d),                                         3.00-3.15                                         (1H, m), 3.25-3.35(8H, m), 3.65-3.75                                         (1H, m), 4.13(2H, t), 4.25-4.55(2H,                                         m),                                         6.75(1H, s), 6.78(1H, s), 7.00(2H,                                         d),                                         8.60(1H, brt), 10.20(1H, brs), 10.30                                         (1H, brs).     5402  C.sub.38 H.sub.35 N.sub.5 O.sub.7                            d.sub.6 -DMSO/400 MHz                                         2.70(6H, m), 2.80(2H, m), 3.55(2H,                                         s),                                         3.70(6H, s), 6.61(1H, s), 6.63(1H,                                         s),                                         6.80(1H, s), 6.82(1H, s), 7.22(2H,                                         d),                                         7.68(4H, d), 7.82(2H, d), 7.98(2H,                                         d),                                         8.22(2H, d), 10.15(1H, s), 10.55                                         (1H, brs).     5402.HCl           C.sub.38 H.sub.35 N.sub.5 O.sub.7.HCl                    674(80)                         ESI                            d.sub.6 -DMSO/400 MHz                                         3.00-3.50(8H, m), 3.73(2x3H, s),                                         4.25                                         (2H, m), 6.75(1H, s), 6.79(1H, s),                                         6.86                                         (1H, s), 6.88(1H, s), 7.29(2H, d),                                         7.69                                         (2H, d), 7.77(4H, m), 8.00(2H, d),                                         8.25                                         (2H, d), 10.25(1H, s), 10.55(1H,                                         brs),                                         10.70(1H, brs).     5376  C.sub.33 H.sub.34 N.sub.4 O.sub.4.HCl                    551(100)                         ESI                            d.sub.6 -DMSO/400 MHz                                         2.11-2.20(2H, m), 2.78(6H, s),                                         2.83-2.82                                         (2H, m), 3.20(2H, m), 3.62(2H, brs),                                         4.09                                         (2H, t), 4.75(2H, brs), 6.77(1H, s),                                         6.79                                         (1H, s), 7.00(2H, d), 7.19(4H, brs),                                         7.50                                         (2H, d), 7.55(2H, d), 7.60(2H, d),                                         10.19                                         (1H, brs), 10.32(1H, brs), 10.55                                         (1H, brs).     5299  C.sub.21 H.sub.24 N.sub.4 O.sub.2 S                            d.sub.6 -DMSO/400 MHz                                         2.18(6H, s), 2.47(2H, t), 3.01(3H,                                         s),                                         3.40(2H, d), 5.98(1H, d), 6.71(1H,                                         s),                                         6.85(1H, s), 7.26(1H, d), 7.31(1H,                                         m),                                         7.41(2H, m), 7.52(2H, d), 9.85(1H,                                         brs).     1912  C.sub.23 H.sub.24 N.sub.4 O.sub.3                    404(55)                         EI d.sub.6 -DMSO/400 MHz                                         2.25(6H, s), 2.93(2H, s), 4.30(2H,                                         d),                                         6.74(1H, s), 6.76(1H, s), 7.28-7.55                                         (9H, m), 8.25(1H, t), 10.20(2H,     __________________________________________________________________________                                         brs).     Mol. Formula Mass spec      .sup.1 H nmr Microanalysis     No. (M. Wt)  m/z, mass intensity (mode)                                 Solvent δ all 400 MHz                                              Calc   Found     __________________________________________________________________________     1927         C.sub.16 H.sub.14 N.sub.4 O.sub.2                  291, 30%; 295, MH.sup.+  100%                                 CDCl.sub.3 + TFA         294      (DCI, NH.sub.3)                                 2.45(3H, s), 6.85                                 (1H, s),                                 7.38(1H, s), 7.48                                 (5H, m),                                 8.95(1H, s).     1926         C.sub.15 H.sub.12 N.sub.4 O.sub.2                  281 MH.sub.+  100%                                 CDCl.sub.3 + TFA         280      (DCI, NH.sub.3)                                 7.20(1H, s), 7.45                                 (8H, m).     1545         C.sub.21 H.sub.17 N.sub.3 O.sub.3                  192, 20%; 292, 10%,                                 CDCl.sub.3  + CF.sub.3 CO.sub.2 D         359      MH.sup.+  360  7.82(1H, d),                  (DCI NH.sub.3) 7.75(1H, d),                                 7.65(1H,),                                 7.48(3H, m),                                 7.35(2H, m),                                 7.25(1H, s),                                 7.06(2H, d),                                 3.98(3H, s).     1542         C.sub.16 H.sub.10 N.sub.2 O.sub.3 Cl.sub.2                  349, 351, 353, 100%;                                 CDCl.sub.3 /TFA         348      366, 368, 370, 50%;                                 6.72(1H, s),                  313, 39%.      7.18(2H, 2xs),                  (DCI NH.sub.3) 7.34(1H, t),                                 7.43(2H, d),                                 7.59(1H, s).     1509         C.sub.20 H.sub.15 N.sub.3 O.sub.2                  347 MNH.sub.4.sup.+, 1%;                                 CDCl.sub.3 /TFA                  330 MH.sup.+, 100%                                 7.22-7.40(3H, m),                  (DCI NH.sub.3) 7.40-7.52(6H, m),                                 7.60(1H, s), 7.78                                 (1H, d, J=7Hz),                                 7.81(1H, s), 8.10                                 (1H, s).     1507         C.sub.22 H.sub.23 N.sub.3 O.sub.5                  310, 100%;     CDCl.sub.3 + CF.sub.3 CO.sub.2 D                                              C  64.54                                                     64.45                                                         64.39         407      336, 20%;      7.65(1H, s), H  5.66                                                     5.61                                                         5.62                  351, 20%;      7.48(1H, brs),                                              N  10.26                                                     10.46                                                         10.43                  MH.sup.+  410, 5%                                 7.42(2H, d), 7.22                  MNH.sub.4.sup.+, 427, 2%                                 (1H, s),                  (DCI NH.sub.3) 7.00(2H, d),                                 6.72(1H, brd),                                 6.39(1H, brd),                                 3.90(3H, s), 1.65                                 (9H, s).     1506         C.sub.26 H.sub.25 N.sub.3 O.sub.5                  360, 100%;     CDCl.sub.3 + CF.sub.3 CO.sub.2 D                                              C  67.96                                                     67.54                                                         67.63         459      MH.sup.+  460, 8.27(1H, d)  H  5.48                                                     5.35                                                         5.30                  MNH.sub.4.sup.+  477, 2%                                 8.05(1H, s)  N  9.14                                                     9.21                                                         9.22                  (DCI NH.sub.3) 7.70(1H, d),                                 7.47(3H, m),                                 7.38(2H, pt),                                 7.25(1H, s),                                 7.05(2H, d),                                 3.90(3H, s),                                 1.65(9H, s).     1476         C.sub.17 H.sub.14 N.sub.2 O.sub.4                  279, 15%; MH.sup.+, 311;                                 CDCl.sub.3 + CF.sub.3 CO.sub.2 D                                              C  65.80                                                     65.87                                                         65.68         310      MNH.sub.4.sup.+, 328, 2%                                 7.85(1H, s), H  4.55                                                     4.44                                                         4.54                  (DCI NH.sub.3) 7.60(1H, brs),                                              N  9.03                                                     9.03                                                         8.98                                 7.42(2H, d),                                 7.21(1H, s),                                 7.08(1H, s),                                 7.02(2H, d),                                 6.72(1H, brs),                                 3.90(3H, s).     1474         C.sub.17 H.sub.14 N.sub.2 O.sub.3                  279, 10%; MH+, 327                                 CDCl.sub.3 + CF.sub.3 CO.sub.2 D                                              C  62.56                                                     62.41                                                         62.39         326      (DCI NH.sub.3) 7.60(1H, d), H  4.32                                                     4.41                                                         4.46                                 7.45(3H, m), N  8.58                                                     8.57                                                         8.55                                 7.35(1H, s),                                 7.23(2H, m),                                 7.05(2H, d),                                 3.90(3H, s).     1950         C.sub.25 H.sub.27 N.sub.3 O.sub.4                  MH+ (100%) 434 CDCl.sub.3 CF.sub.3 CO.sub.2 D 400                                              CHZ                                                 69.57                                                     68.98                                                         69.06         433      CI/NH.sub.3    7.50-7.42(m, 5H),                                              H  6.28                                                     6.25                                                         6.25                                 7.25-7.15(m, 4H),                                              N  9.69                                                     9.59                                                         9.60                                 7.00(d, 1H),                                 6.96(d, 1H),                                 6.90(d, 1H),                                 4.41(t, 2H),                                 3.90(2, 3H),                                 3.67(t, 2H),                                 3.12(s, 6H).     1718         C.sub.21 H.sub.17 N.sub.3 O.sub.3                  MH.sup.+  360, 100%                                 DMSO         359      (DCI NH.sub.3) 11.4(1H, s),                                 10.08(1H, s),                                 9.82(1H, s),                                 7.55(3H, m),                                 7.39(1H, d),                                 7.18(1H, t),                                 7.01(4H, m)                                 6.85(1H, s),                                 6.78(1H, s),                                 3.80(3H, s).     1693         C.sub.22 H.sub.19 N.sub.3 O.sub.5 S                  360, 85%; 402, 25%, MH.sup.+ 438                                 7.98(1H, d),         437      (DCI NH.sub.3) 7.88(1H, s),                                 7.75(1H, d),                                 7.45(5H, m),                                 7.35(1H, s),                                 7.02(2H, d),                                 3.90(3H, s),                                 3.30(2.33H, s).     1618         C.sub.23 H.sub.21 N.sub.3 O.sub.4 S                  436, 100%;     CDCl.sub.3 TFA         435      336, 82%       1.75(9H, s),                                 7.22-7.28(overlapping                                 solvent & sample                                 signals),                                 7.36-7.50(6H,                                 overlapping signals),                                 7.61(2H, overlapping                                 signals),                                 8.10(1H, s).     1560         C.sub.25 H.sub.21 N.sub.3 O.sub.4 Cl.sub.2                  498/500/502    DMSO-D6         497      (100/69/15)%   1.68(9H, s),                  398/400/402    6.66(1H, s),                  (49/31/7)%     6.92(1H, s),                                 7.30-7.44(3H, c),                                 7.49(2H, d),                                 7.68(1H, d),                                 8.08(1H, d),                                 8.17(1H, s).     1470         C.sub.21 H.sub.21 N.sub.3 O.sub.4                  397, MNH.sub.4, 4%: 380, MH.sup.+,                                 CDCl.sub.3                  13%, 280, 100% 1.64(9H, s), 6.33                  (DCI NH.sub.3) (1H, br.s),                                 6.57(1H, br.s),                                 7.00(1H, s),                                 7.35-7.50(7H, m),                                 8.10(1H, br.s),                                 8.18(1H, br.s)     1471         C.sub.25 H.sub.23 N.sub.3 O.sub.4                  447, MNH.sub.4.sup.+, 17%; 430, MH.sup.+,                                 CDCl.sub.3                  100%; 330, 82% 1.72(9H, s), 7.07                                 (1H, s),                                 7.14(1H, s),                                 7.30-7.50(7H, m),                                 7.66(1H, d, J=7Hz),                                 7.84(1H, s),                                 8.03(1H, br.s),                                 8.18(2H, m)     1729         C.sub.23 H.sub.19 N.sub.3 O.sub.5                  435, MNH.sub.4.sup.+, 23%; 418, MH.sup.+,                                 CDCl.sub.3                  100%           3.09(4H, s),                  (DCI NH.sub.3) 3.92(3H, s),                                 7.07(2H, d, J=7Hz),                                 7.28(1H, s),                                 7.30(1H, s),                                 7.39(2H, d, J=6Hz),                                 7.45(2H, d, J=7Hz),                                 7.60(2H, d, J=6Hz)     1647         C.sub.23 H.sub.21 N.sub.3 O.sub.3                  405, M.sup.+ NH.sub.4, 7%; 388, M.sup.+ H,                                 CDCl.sub.3         387      100%; 317, 43%; 459, 29%                                 1.84-2.00(4H, m),                  DCI NH.sub.3   3.13(2H, t), 3.64                                 (2H, t),                                 6.98(1H, s), 7.03                                 (1H, s),                                 7.32-7.50(9H, m),                                 8.10(1H, brs),                                 8.32(1H, brs)     1845         C.sub.21 H.sub.17 N.sub.3 O.sub.5                  409, M.sup.+ NH.sub.4, 35%; 392, MH.sup.+,                                 CDCl.sub.3 + TFA                                              C  64.45                                                     63.99                                                         63.94         391      100%           2.35(3H, s, Ac),                                              H  4.38                                                     4.42                                                         4.37                  (DCI NH.sub.3) 6.05(2H, s, OCH.sub.2 O),                                              N  10.74                                                     10.99                                                         11.01                                 6.85-7.60(9H, m)     1809         C.sub.20 H.sub.16 N.sub.2 O.sub.5                  382, M.sup.+  + NH.sub.4, 5%; 365, MH.sup.+,                                 CDCl.sub.3 + TFA                                              C  65.93                                                     65.85                                                         65.96         364      100%           3.85(3H, s, OMe),                                              H  4.43                                                     4.38                                                         4.37                  (DCI NH.sub.3) 6.05(2H, s, OCH.sub.2 O),                                              N  7.69                                                     7.60                                                         7.65                                 6.90-7.45(9H, m)     1808         C.sub.19 H.sub.14 N.sub.2 O.sub.4                  335, M.sup.+ +1, 100%                                 CDCl.sub.3 + TFA                                              C  68.26                                                     68.07                                                         68.00         334                     6.05(2H, s, OCH.sub.2 O),                                              H  4.22                                                     4.15                                                         4.17                                 6.90-7.50(10H, m)                                              N  8.38                                                     8.35                                                         8.35     1929         C.sub.22 H.sub.18 N.sub.4 O.sub.2                  MH.sup.+, 371  CDCl.sub.3 + TFA         370      (DCI NH.sub.3) 5.45(2H, s),                                 7.18(1H, s),                                 7.26(1H, s),                                 7.30(1H, s),                                 7.45(10H, m),                                 8.88(1H, s)     1930         MH.sup.+, 357, 100%                                 CDCl.sub.3 + TFA                  (DCI NH.sub.3) 7.27(1H, s),                                 7.30(1H, s),                                 7.50(5H, m),                                 7.65(5H, m),                                 7.75(1H, t),                                 9.10(1H, s).     1975         C.sub.27 H.sub.29 N.sub.5 O.sub.3                  236, 25%; 257, 100%; 376,                                 CDCl.sub.3 + TFA                  20%; MH.sup.+, 472, 20%                                 2.35(2H, m),                  DCI NH.sub.3   3.01(6H, s),                                 3.45(2H, t),                                 4.18(2H, t),                                 5.40(2H, s),                                 6.95(2H, d),                                 7.20(1H, m),                                 7.25(1H, s),                                 7.40(3H, m),                                 7.50(3H, m).     1976         C.sub.26 H.sub.27 N.sub.5 O.sub.3                  230, 100%; 247, 60%; MH.sup.+,                                 CDCl.sub.3 + TFA         457      458, 90%.      2.30(2H, m),                  DCI NH.sub.3   2.05(6H, s),                                 3.45(2H, t),                                 4.18(2H, t),                                 6.98(2H, d),                                 7.25(2H, d),                                 7.45(2H, d),                                 7.55(3H, m),                                 7.75(3H, m),                                 9.18(1H, s).     1982         C.sub.24 H.sub.28 N.sub.4 O.sub.3.2HCl                  405, 100%, MH.sup.+                                 D.sub.2 O         404+73   EI.sup.+       2.98(3H, s),                                 3.09(6H, s),                                 3.75(4H, brs),                                 4.50(2H, s),                                 7.09(1H, s),                                 7.13(1H, s),                                 7.52-7.68(5H, c),                                 7.67-7.77                                 (4H, overlapping                                 signals).     1983         C.sub.26 H.sub.30 N.sub.4 O.sub.2                  431, 25%, MH.sup.+ ;                                 DMSO-D6                  332, 30%; 303, 18%;                                 1.53(2H, m),                  84, 92%: 118, 100%.                                 1.71(2H, d),                  EI.sup.+       1.83(2H, t),                                 2.12(3H, s),                                 2.14(3H, s),                                 2.35(1H, m),                                 2.80(2H, d),                                 3.57(2H, s),                                 6.78(2H, overlapping                                 signals),                                 7.34(3H, overlapping                                 signals),                                 7.43(2H, t),                                 7.50(2H, d),                                 7.57(2H, d).     1886         C.sub.29 H.sub.21 N.sub.3 O.sub.7                                 CDCl.sub.3 /TFA                                 3.90(3H, s),                                 4.79(2H, s),                                 7.01(2H, d, J=8Hz),                                 7.21(1H, s),                                 7.24(1H, s),                                 7.27(2H, d), J=8Hz),                                 7.41(2H, d, J=8Hz),                                 7.47(2H, d, J=8Hz),                                 7.82(2H, m),                                 7.97(2H, m).     1657         C.sub.20 H.sub.19 N.sub.3 O.sub.3                  MH.sup.+, 350, 12%; M.sup.+, 349, 13%;                                 CDCl.sub.3 /TFA         349      333, 100%.     3.92(3H, s), 4.32                  CI NH.sub.3    (2H, s),                                 7.05(2H, d), 7.24                                 (2H, d),                                 7.45(2H, d), 7.52                                 (4H, s).     1891         C.sub.23 H.sub.24 N.sub.2 O.sub.4                  392, M.sup.+, 25%; 347, M.sup.+ -                                 DMSO         C  70.39                                                     70.31                                                         70.03         392      OCH.sub.2 CH.sub.3, 100%                                 1.15(6H, t, J=6Hz,                                              H  6.16                                                     6.16                                                         6.16                  EI             CH.sub.3),   N  7.14                                                     7.03                                                         7.09                                 3.45-3.60 (4H, m,                                 CH.sub.2 CH.sub.3),                                 5.50(1H, s, O.sub.2 CH),                                 6.75(2H, s),                                 7.28-7.55(9H, m,Ar),                                 10.25(2H, br.s, NH)     1912         C.sub.23 H.sub.24 N.sub.4 O.sub.3                  404, M.sup.+, 55%; 303, M.sup.+ -                                 DMSO         404      NHC(O)CH.sub.2 NMe.sub.2, 30%:                                 2.25(6H, s, 2xMe),                  EI             2.95(2H, s),                                 4.30(2H, d, J=6Hz),                                 6.74(1H, s), 6.76                                 (1H, s),                                 7.28-7.55(9H, m),                                 8.24-8.27(1H, br.m, NH),                                 10.20(2H, br.s, 2xNH)     1676         C.sub.22 H.sub.19 O.sub.3 N.sub.3                  MH.sup.+, 100%, 374                                 CDCl.sub.3, CF.sub.3 CO.sub.2 D         373      (DCI/NH.sub.3) 7.65(2H, d), 7.58                                 (2H, d),                                 7.48(2H, d),                                 7.41-7.35(4H, m),                                 7.24(1H, s),                                 7.12-7.07(2H, m),                                 2.36+2.23(3H, s,                                 rotamers).     1959         C.sub.25 H.sub.28 N.sub.3 O.sub.4 Cl                  CI/NH.sub.3    d.sub.6 -DMSO 400 MHz         469/471                 10.85(1H, s),                                 10.10(1H, brs),                                 10.02(1H, s),                                 7.6-7.30(7H, m),                                 7.10(2H, m),                                 6.85(1H, d),                                 6.80(1H, s),                                 6.58(1H, d),                                 4.36(2H, t),                                 3.87(3H, s),                                 3.50(2H, t),                                 2.88(6H, s).     1921         C.sub.22 H.sub.21 N.sub.3 O.sub.2                  MH.sup.+, 100%, 360                                 CDCl.sub.3 + CF.sub.3 CO.sub.2 D                                              C  73.52                                                     73.24                                                         73.11         359      CI/NH.sub.3    7.81(2H, d), H  5.89                                                     5.82                                                         5.77                                 7.52(2H, d), N  11.69                                                     11.50                                                         11.52                                 7.40-7.50(6H, m),                                 7.24(1H, s),                                 6.98(1H, d),                                 6.96(1H, d),                                 3.33(6H, s),     1922         C.sub.26 H.sub.20 N.sub.2 O.sub.2                  MH.sup.+, 393, 100%: MNH.sup.+, 410,                                 d.sub.6 -DMSO         392      10%            11.15(1H, brs),                  CI/NH.sub.3    10.00(1H, brs),                                 7.66(1H, d),                                 7.51-7.30(13H, m),                                 7.20(2H, m),                                 6.78(1H, s),                                 6.83(1H, d).     1923         C.sub.20 H.sub.15 N.sub.3 O.sub.4                  MH.sup.+, 362, 100%                                 CDCl.sub.3 CF.sub.3 CO.sub.2 D                                              C  66.48                                                     66.61                                                         66.54         361      (DCI NH.sub.3) 8.25(2H, d), H  4.18                                                     4.23                                                         4.26                                 7.83(2H, d), N  11.63                                                     11.40                                                         11.48                                 7.63(1H, dd),                                 7.55-7.45(5H, m),                                 7.35(1H, s),                                 7.12(1H, d),                                 7.08(1H, d).     1672         C.sub.20 H.sub.23 N.sub.3 O.sub.3                  MH.sup.+, 354, 100%; MNH.sup.+, 371,                                 CDCl.sub.3, CF.sub.3 CO.sub.2 D         353      10%; 271, 10%; 260, 10%                                 7.59(2H, d),                  (DCI NH.sub.3) 7.45(2H, d),                                 7.18(1H, s),                                 6.29(1H, d),                                 2.55-2.47(1H, m),                                 2.36-2.22                                 (3H, s, rotamers),                                 1.82-1.70(5H, s),                                 1.51-1.40(2H, m),                                 1.32-1.20(3H, m).     1884         C.sub.18 H.sub.20 N.sub.2 O.sub.2                  MH.sup.+, 297, 100%; MNH.sup.+, 315,                                 CDCl.sub.3, CF.sub.3 CO.sub.2 D         296      10%            7.48-7.38(5H, m),                  (DCI NH.sub.3) 7.21(1H, s),                                 6.26(1H, d),                                 2.48(1H, m),                                 1.83-1.70(1H, m),                                 1.35(2H, m),                                 1.30-1.19(3H, m).     1570         C.sub.17 H.sub.14 N.sub.2 O.sub.2 S                  311, M.sup.+ H, 100%                                 CDCl.sub.3   C  65.79                                                     65.24                                                         65.20         310      DCI-NH.sub.3   4.13(3H, s), H  4.55                                                     4.53                                                         4.49                                 6.59(1H, s), N  9.03                                                     8.73                                                         8.79                                 7.10(1H, m),                                 7.30-7.60(8H, m),                                 8.09(1H, brs).     __________________________________________________________________________ 

We claim:
 1. A compound selected from(3Z,6Z)-3-Benzylidene-6-(4-imidazolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(1-imidazolyl)benzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(1-imidazolylmethyl)benzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(2-dimethylaminoethoxy)-3-methoxybenzylidene)-2,5-piperazinedione hydrochloride; (3Z,6Z)-3-Benzylidene-6-(4-(5-methylimidazolyl))methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-dimethylaminocinnamylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)benzylidene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(2-imidazolylethoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-nitrocinnamylidene-2,5-piperazinedione; (3Z,6Z)-3-(4-Aminomethylbenzylidene)-6-(4-methoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(1-methanesulfonyl-3-indolyl)methylene-6-(4-methoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(4-phthalimidoacetoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(γ-phenylcinnamylidene)-2,5-piperazinedione; (3Z,6Z)-3-(1-tert-butoxycarbonyl-3-indolyl)methylene-6-(2-thenylidene-2,5-piperazinedione; (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(1-tert-butoxycarbonyl-3-indolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(2-dimethylaminoethoxy)-3-methoxycinnamylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolylmethyl)benzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-N-methyl-N-(4-(N-methylpiperidinyl))aminomethylbenzylidene-2,5-piperazinedione; ((3Z,6Z)-3-Benzylidene-6-(3-indolylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(3-Indolylmethylene)-6-(4-methoxybenzylidene)-2,5-piperazinedione (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(3-(1-tertbutoxycarbonyl)indolyl)methylene-2,5-piperazinedione; (3Z,6Z,-3-(4-Methoxybenzylidene)-6-(2-(1-tertbutoxycarbonyl)pyrrolyl)methylene-2,5-piperazinedione; (3Z,3Z)-3-(4-Methoxybenzylidene)-6-(3-(1-tert-butoxyarbonyl)indolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(3-(1-tert-butoxycarbonyl)indolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-(4-Methoxybenzylidene)-6-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(Acetamidobenzylidene)-6-cyclohexylmethylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Acetamidobenzylidene)-6-cinnamylidene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(diethoxymethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(N-methyl-N-(2-dimethylaminoethyl)aminomethylbenzylidene-2,5-piperazinedione hydrochloride; (3Z,6Z)-3-Benzylidene-6-cyclohexylmethylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Acetamidobenzylidene)-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(2-Indolylmethylene)-6-(4-methoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(2-(1-tertbutoxycarbonyl)pyrrolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Dimethylaminomethylbenzylidene)-6-(4-(3-dimethylaminopropoxy)benzylidene-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)methylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)benzylidene; (2-(4-(3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzoyl)-1,2,3,4-tetrahydroisoquinoline; N-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)-4-((3Z,6Z)-6(4-(3-dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(4-(1,2,3,4-Tetrahydro-2-isoquinolyl)butyl)-4-((3Z,6Z)-6-(4-(3-dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzamide; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene-3-(4-pyridylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-pyridylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-furfurylidene-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-Thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(2-Thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-Furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(2-Naphthylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(1-Naphthylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(3-dimethylamino-2-hydroxypropoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-morpholinopropoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-(1-imidazolyl)propoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-(4-(2-hydroxyethyl)-1-piperazinyl)propoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(3-Furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(3-thenylidene-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(5-methylthio-2-thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-morpholinoethoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-(1-imidazolyl)ethoxy)benzylidene)2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-(1-pyrrolidinyl)ethoxy)benzylidene)2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxymethyl)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxymethyl)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-Dimethylaminoacetamidomethyl benzylidene)-3-(3-thenylidene)-2,5-piperazinedione; (3Z,6Z)-3-(2-Bromobenzylidene)-6-(4-dimethylaminoacetamidomethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-Dimethylaminoacetamidomethylbenzylidene)-3-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-dimethylaminoacetamidomethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethylthiomethyl)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethylthiomethyl)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-dimethylaminoacetamidoaminomethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethoxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-dimethylaminoethoxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethyl)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-(2-dimethylaminoethoxy)ethoxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(6-dimethylaminohexyloxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethyl)methylamino-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(2,5-Dichloro-3-thenylidene)-6-benzylidene-2,5-piperazinedione; N-(4-(1,2,3,4-Tetrahydro-2-isoquinolyl)butyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(2-(1,2,3,4-Tetrahydro-2-isoquinoyl)ethyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(3-(1,2,3,4-Tetrahydro-2-isoquinolyl)propoyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(4-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)phenyl-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(4-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)phenyl)-4-((3Z,6Z)-2,5-dioxo-6-(4-nitrobenzylidene)-3-piperazinylidene)methylbenzamide.
 2. A compound which is a piperazine of general formula (A): ##STR22## wherein one of R₁ and R₂ is a phenyl group which is substituted by X, C(O)X, OC(O)CH₂ X or C₂ X wherein X is a heterocyclic ring selected from the group consisting of pyridyl, imidazolyl, furyl, pyrrolyl, pyrrolidinyl, thienyl, piperazinyl, piperidinyl, morpholinyl, quinolyl, isoquinolyl and indolyl, the heteroatoms(s) when nitrogen being optionally substituted by methyl;and the other of R₁ and R₂ is a phenyl group optionally substituted by one or more groups selected from halogen nitro, methoxy, NHC(O)R₁₂, CO₂ H, O(CH₂)_(n) N(R₁₂ R₁₃), C₁ -C₄ alkyl and (CH₂)_(n) C(O)OR₁₂ ; R₁₂ and R₁₃, which may be the same or different, are hydrogen or C₁ -C₆ alkyl; and n is 0 or an integer having the value 1, 2, 3 or 4; or a pharmaceutically acceptable salt thereof or a pharmaceutically acceptable ester thereof selected from branched and unbranched, saturated and unsaturated C₁ -C₆ alkyl esters.
 3. A compound which is a piperazine of general formula (A): ##STR23## wherein one or both of R₁ and R₂, which are different, is: (I) a phenyl group substituted by CH₂ NR₁₂ R₁₃, OC(O)(CH₂)_(n) Z, CH(OR₁₂)(OR₁₃), (CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) NR₁₂ R₁₃, --CH₂ NR₁₂ --(CH₂)_(n) NR₁₅ R₁₆, O(CH₂)_(n) CH(OH)(CH₂)_(n) N(R₁₂ R₁₃);(II) a group CH═C(W)V; or (III) a cyclohexyl group;and where appropriate, the other of R₁ and R₂ is phenyl group optionally substituted by one or more groups independently selected from halogen, nitro, methoxy, NHC(O)R₁₂, CO₂ H, O(CH₂)_(n) N(R₁₂ R₁₃), CH₂ Y(CH₂)_(n) N(R₁₂ R₁₃), C₁ -C₄ alkyl and (CH₂)_(n) C(O)OR₁₂ ; Y is O or S; Z is a C₃ -C₆ cycloalkyl group; R₁₂, R₁₃ and R₁₄, which may be the same or different, are hydrogen or C₁ -C₆ alkyl; R₁₅ and R₁₆, which may be the same or different, are hydrogen or C₁ -C₆ alkyl; W is hydrogen or a phenyl group; V is a phenyl group optionally substituted by one or more groups independently selected from nitro, alkoxy and O(CH₂)_(n) NR₁₂ R₁₃ ; and m and n are each, independently, 0 or an integer having the value 1, 2, 3 or 4; a pharmaceutically acceptable salt thereof or a pharmaceutically acceptable ester thereof selected from branched and unbranched, saturated and unsaturated, C₁ -C₆ alkyl esters.
 4. A compound according to claim 3 wherein R₁₂ and R₁₃, which may be the same or different, are hydrogen or C₁ -C₃ alkyl and n is an integer of value 1 or
 2. 5. A compound according to claim 3 wherein one of R₁ and R₂ is a phenyl group substituted by CH₂ NR₁₂ R₁₃, OC(O)(CH₂)_(n) Z, CH(OR₁₂)(OR₁₃), (CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) NR₁₂ R₁₃ ; wherein R₁₂, R₁₃ and R₁₄, which may be the same or different, are independently selected from hydrogen and C₁ -C₃ alkyl;Z is a C₅ or C₆ cycloalkyl group; and m and n are, independently, integers having the values 1, 2 or
 3. 6. A compound according to claim 3 wherein R₁₂, R₁₃, R₁₄, which may be the same or different, are independently selected from hydrogen and C₁ -C₂ alkyl;Z is a cyclopentyl group; and m and n are, independently, integers having the values of 1 or
 2. 7. A pharmaceutical composition comprising a pharmaceutically acceptable carrier or diluent and, as an active ingredient, a compound as claimed in claim 1 or
 2. 8. A method of treating a patient suffering from a thrombotic disease, thrombotic disorder or haemostatic disorder, the said disease or disorder being associated with elevated levels of PAI-1, which method comprises administering to the patient a therapeutically effective amount of a compound as claimed in claim 7 or
 3. 9. A method according to claim 8 wherein the patient is suffering from myocardial infarction, deep vein thrombosis or disseminated intravascular coagulation.
 10. A method of treating a patient suffering from a thrombotic disease, thrombotic disorder or haemostatic disorder, the said disease or disorder being associated with elevated levels of PAI-1, which method comprises administering to the patient a therapeutically effective amount of a compound which is a piperazine of formula (A): ##STR24## wherein one or both of R₁ and R₂, which are the same or different, is:(I) X, of a phenyl group which is substituted by X, C(O)X, OC(O)CH₂ X, OCH₂ CH₂ X, CH₂ X, CONH(CH₂)_(n) X, O(CH₂)_(n) CH(OH)(CH₂)_(n) X or ##STR25## (II) a phenyl group substituted by CH₂ NR₁₂ R₁₃, OC(O)(CH₂)_(n) Z, CH(OR₁₂)(OR₁₃), (CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) NR₁₂ R₁₃ or O(CH₂)_(n) CH(OH)(CH₂)_(n) N(R₁₂ R₁₃); or (III) a group CH═C(W)V; or (IV) a cyclohexyl group;and where appropriate, the other of R₁ and R₂ is a phenyl group optionally substituted by one or more groups independently selected from halogen, nitro, methoxy, NHC(O)R₁₂, CO₂ H, O(CH₂)_(n) N(R₁₂ R₁₃) and CH₂ Y(CH₂)_(n) N(R₁₂ R₁₃); R₃ is C₁ -C₄ alkyl or (CH₂)_(n) C(O)OR₁₄ ; X is a five- or six-membered saturated or unsaturated heterocyclic ring selected from the group consisting of pyridyl, imidazolyl, furyl, pyrrolyl, pyrrolidinyl, thienyl, piperazinyl, piperidinyl, morpholinyl, quinolyl, isoquinolyl and indolyl, the heteroatom(s) of the said heterocyclic ring, when nitrogen, being optionally substituted by hydrogen, methyl, oxygen, tertiary-butyloxycarbonyl, --CH₂)_(n) CH₂ OH or SO₂ Me; the heterocyclic ring being optionally substituted by halogen, Me, MeS, phenyl, O(CH₂)_(n) NR₁₂ R₁₃, --N(R₁₂)(CH₂)_(n) N(R₁₂ R₁₃), --(CH₂)_(n) N(R₁₂ R₁₃) or --O(CH₂)_(n) O(CH₂)_(n) N(R₁₂ R₁₃), or the heterocyclic ring optionally having one or more carbonyl groups; Y is O or S; Z is a C₃ -C₆ cycloalkyl group; R₁₂, R₁₃ and R₁₄, which may be the same or different, are hydrogen or C₁ -C₆ alkyl; R₁₅ and R₁₆, which may be the same or different, are hydrogen or C₁ -C₆ alkyl; W is hydrogen or a phenyl group; V is a phenyl group optionally substituted by one or more groups independently selected from nitro, alkoxy and O(CH₂)_(n) NR₁₂ R₁₃ ; and m and n are each, independently, 0 or an integer having the value 1, 2, 3 or 4;a pharmaceutically acceptable salt thereof or a pharmaceutically acceptable ester thereof, selected from the group consisting of branched and unbranched saturated and unsaturated C₁ -C₆ alkyl esters.
 11. A method according to claim 10 wherein, in formula (A), one or both of R₁ and R₂, which may be the same or different, is chosen from X and a phenyl group substituted by X, C(O)X, OC(O)CH₂ X, OCH₂ CH₂ X, CH₂ X;X is a five- or six-membered heterocyclic ring, as defined in claim 1, the heteroatom(s) of the said heterocyclic ring, when nitrogen, being optionally substituted by hydrogen, methyl, oxygen, tertiary-butyloxycarbonyl or SO₂ Me; the heterocyclic ring being optionally substituted by hydrogen, methyl, phenyl, O(CH₂)_(n) N(R₁₂ R₁₃) or optionally having one or more carbonyl groups; and Y, R₁₂, R₁₃ and n are as defined in claim
 1. 12. A method according to claim 10, wherein, in formula (A), R₁₂ and R₁₃, which may be the same or different, are hydrogen or C₁ -C₃ alkyl and n is an integer of value 1 or
 2. 13. A method according to claim 10 wherein, in formula (A), one of R₁ and R₂ is a phenyl group which is substituted by X, C(O), OC(O)CH₂ X, OCH₂ CH₂ X, CH₂ X or which is fused to a group X; wherein X is a heterocyclic ring as defined in claim 10, the heteroatoms(s), when nitrogen, being optionally substituted by methyl.
 14. A method according to claim 10 wherein, in formula (A), one of R₁ and R₂ is a phenyl group substituted by CH₂ NR₁₂ R₁₃, OC(O)(CH₂)_(n) Z, CH(OR₁₂)(OR₁₃), (CH₂)_(n) NR₁₄ C(O)(CH₂)_(m) NR₁₂ R₁₃ ; wherein R₁₂, R₁₃ and R₁₄, which may be the same or different, are independently selected from hydrogen or C₁ -C₃ alkyl;Z is a C₅ or C₆ cycloalkyl group; and m and n are, independently, integers having the values 1, 2 or
 3. 15. A method according to claim 10 wherein, in formula (A), R₁₂, R₁₃ and R₁₄, which may the same or different, are independently selected from hydrogen and C₁ -C₂ alkyl;Z is a cyclopentyl group; and m and n are, independently, integers having the values of 1 or
 2. 16. A method of treating a patient suffering from a thrombotic disease, thrombotic disorder or haemostatic disorder, the said disease or disorder being associated with elevated levels of PAI-1 which method comprises administering to the patient a therapeutically effective amount of a compound selected from(3Z,6Z)-3-Benzylidene-6-(4-imidazolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(1-imidazolyl)benzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(1-imidazolylmethyl)benzylidene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(2-dimethylaminoethoxy)-3-methoxybenzylidene)-2,5-piperazinedione hydrochloride; (3Z,6Z)-3-Benzylidene-6-(4-(5-methylimidazolyl))methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-dimethylaminocinnamylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)benzylidene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(2-imidazolylethoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-nitrocinnamylidene-2,5-piperazinedione; (3Z,6Z)-3-(4-Aminomethylbenzylidene)-6-(4-methoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(1-methanesulfonyl-3-indolyl)methylene-6-(4-methoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(4-phthalimidoacetoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(γ-phenylcinnamylidene)-2,5-piperazinedione; (3Z,6Z)-3-(1-tert-butoxycarbonyl-3-indolyl)methylene-6-(2-thenylidene)-2,5-piperazinedione; (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(1-tert-butoxycarbonyl-3-indolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(2-dimethylaminoethoxy)-3-methoxycinnamylidene-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene-6-(4-(1-imidazolylmethyl)benzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-N-methyl-N-(4-(N-methylpiperidinyl))aminomethylbenzylidene-2,5-piperazinedione; ((3Z,6Z)-3-Benzylidene-6-(3-indolylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(3-Indolylmethylene)-6-(4-methoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(2,6-Dichlorobenzylidene)-6-(3-(1-tertbutoxycarbonyl)indolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(2-(1-tertbutoxycarbonyl)pyrrolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(3-(1-tertbutoxycarbonyl)indolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(3-(1-tertbutoxycarbonyl)indolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(Acetamidobenzylidene)-6-cyclohexylmethylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Acetamidobenzylidene)-6-cinnamylidene-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(diethoxymethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(4-(N-methyl-N-(2-dimethylaminoethyl)aminomethylbenzylidene-2,5-piperazinedione hydrochloride; (3Z,6Z)-3-Benzylidene-6-cyclohexylmethylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Acetamidobenzylidene)-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(2-Indolylmethylene)-6-(4-methoxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-Methoxybenzylidene)-6-(3,4-methylenedioxybenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-Benzylidene-6-(2-(1-tertbutoxycarbonyl)pyrrolyl)methylene-2,5-piperazinedione; (3Z,6Z)-3-(4-Dimethylaminomethylbenzylidene)-6-(4-(3-dimethylaminopropoxy)benzylidene-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)methylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-3-(4-(3-Dimethylaminopropoxy)benzylidene)-6-(4-(1-imidazolyl)benzylidene; (2-(4-((3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzoyl)-1,2,3,4-tetrahydroisoquinoline; N-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)-4-((3Z,6Z)-6-(4-(3-dimethylaminopropoxy)benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(4-(1,2,3,4-Tetrahydro-2-isoquinolyl)butyl)-4-((3Z,6Z)-6-(4-(3-dimethylaminopropoxy)benzylidene)-2,5-dioxo-3-piperazinylidene)methylbenzamide; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene-3-(4-pyridylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-pyridylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-furfurylidene-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-Thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(2-Thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(2-Naphthylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(3-Dimethylaminopropoxy)benzylidene)-3-(1-Naphthylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(3-dimethylamino-2-hydroxypropoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-morpholinopropoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-(1-imidazolyl)propoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-hydroxy-3-(4-(2-hydroxyethyl)-1-piperazinyl)propoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(3-Furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxy)benzylidene)-3-(5-methylthio-2-thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-morpholinoethoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-(1-imidazolyl)ethoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-(1-pyrrolidinyl)ethoxy)benzylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxymethyl)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethoxymethyl)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-Dimethylaminoacetamidomethyl benzylidene)-3-(3-thenylidene)-2,5-piperazinedione; (3Z,6Z)-3-(2-Bromobenzylidene)-6-(4-dimethylaminoacetamidomethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-Dimethylaminoacetamidomethylbenzylidene)-3-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-dimethylaminoacetamidomethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethylthiomethyl)benzylidene)-3-(3-furylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-(4-(2-Dimethylaminoethylthiomethyl)benzylidene)-3-(3-thenylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-dimethylaminoacetamidoaminomethylbenzylidene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethoxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(4-(2-dimethylaminoethoxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethyl)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-(2-dimethylaminoethoxy)ethoxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(6-dimethylaminohexyloxy)-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-6-Benzylidene-3-(5-(2-dimethylaminoethyl)methylamino-2-thienylmethylene)-2,5-piperazinedione; (3Z,6Z)-3-(2,5-Dichloro-3-thenylidene)-6-benzylidene-2,5-piperazinedione; N-(4-(1,2,3,4-Tetrahydro-2-isoquinolyl)butyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(3-(1,2,3,4-Tetrahydro-2-isoquinolyl)propylpropoyl)-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(4-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)phenyl-4-((3Z,6Z)-6-benzylidene-2,5-dioxo-3-piperazinylidene)methylbenzamide; N-(4-(2-(1,2,3,4-Tetrahydro-2-isoquinolyl)ethyl)phenyl)-4-((3Z,6Z)-2,5-dioxo-6-(4-nitrobenzylidene)-3-piperazinylidene)methylbenzamide.
 17. A method according to claim 10 wherein the patient is suffering from myocardial infarctions deep vein thrombosis or disseminated intravascular coagulation.
 18. A method according to claim 8 or 10 which further comprises the combined administration to the patient of a therapeutically effective amount of tissue plasminogen activator. 